[{"author":[{"id":"2E5DCA20-F248-11E8-B48F-1D18A9856A87","first_name":"Krishnendu","full_name":"Krishnendu Chatterjee","orcid":"0000-0002-4561-241X","last_name":"Chatterjee"},{"first_name":"Thomas A","id":"40876CD8-F248-11E8-B48F-1D18A9856A87","last_name":"Henzinger","full_name":"Thomas Henzinger","orcid":"0000−0002−2985−7724"},{"first_name":"Marcin","last_name":"Jurdziński","full_name":"Jurdziński, Marcin"}],"publist_id":"164","title":"Games with secure equilibria","date_updated":"2021-01-12T07:59:38Z","citation":{"ieee":"K. Chatterjee, T. A. Henzinger, and M. Jurdziński, “Games with secure equilibria,” Theoretical Computer Science, vol. 365, no. 1–2. Elsevier, pp. 67–82, 2006.","short":"K. Chatterjee, T.A. Henzinger, M. Jurdziński, Theoretical Computer Science 365 (2006) 67–82.","apa":"Chatterjee, K., Henzinger, T. A., & Jurdziński, M. (2006). Games with secure equilibria. Theoretical Computer Science. Elsevier. https://doi.org/10.1016/j.tcs.2006.07.032","ama":"Chatterjee K, Henzinger TA, Jurdziński M. Games with secure equilibria. Theoretical Computer Science. 2006;365(1-2):67-82. doi:10.1016/j.tcs.2006.07.032","mla":"Chatterjee, Krishnendu, et al. “Games with Secure Equilibria.” Theoretical Computer Science, vol. 365, no. 1–2, Elsevier, 2006, pp. 67–82, doi:10.1016/j.tcs.2006.07.032.","ista":"Chatterjee K, Henzinger TA, Jurdziński M. 2006. Games with secure equilibria. Theoretical Computer Science. 365(1–2), 67–82.","chicago":"Chatterjee, Krishnendu, Thomas A Henzinger, and Marcin Jurdziński. “Games with Secure Equilibria.” Theoretical Computer Science. Elsevier, 2006. https://doi.org/10.1016/j.tcs.2006.07.032."},"extern":1,"type":"journal_article","status":"public","_id":"4550","page":"67 - 82","volume":365,"doi":"10.1016/j.tcs.2006.07.032","issue":"1-2","date_published":"2006-08-07T00:00:00Z","date_created":"2018-12-11T12:09:26Z","publication_status":"published","year":"2006","day":"07","publication":"Theoretical Computer Science","quality_controlled":0,"publisher":"Elsevier","month":"08","intvolume":" 365","abstract":[{"lang":"eng","text":"In 2-player non-zero-sum games, Nash equilibria capture the options for rational behavior if each player attempts to maximize her payoff. In contrast to classical game theory, we consider lexicographic objectives: first, each player tries to maximize her own payoff, and then, the player tries to minimize the opponent's payoff. Such objectives arise naturally in the verification of systems with multiple components. There, instead of proving that each component satisfies its specification no matter how the other components behave, it sometimes suffices to prove that each component satisfies its specification provided that the other components satisfy their specifications. We say that a Nash equilibrium is secure if it is an equilibrium with respect to the lexicographic objectives of both players. We prove that in graph games with Borel winning conditions, which include the games that arise in verification, there may be several Nash equilibria, but there is always a unique maximal payoff profile of a secure equilibrium. We show how this equilibrium can be computed in the case of ω-regular winning conditions, and we characterize the memory requirements of strategies that achieve the equilibrium."}]},{"title":"Compositional quantitative reasoning","publist_id":"163","author":[{"last_name":"Chatterjee","full_name":"Krishnendu Chatterjee","orcid":"0000-0002-4561-241X","id":"2E5DCA20-F248-11E8-B48F-1D18A9856A87","first_name":"Krishnendu"},{"first_name":"Luca","full_name":"de Alfaro, Luca","last_name":"De Alfaro"},{"last_name":"Faella","full_name":"Faella, Marco","first_name":"Marco"},{"first_name":"Thomas A","id":"40876CD8-F248-11E8-B48F-1D18A9856A87","full_name":"Thomas Henzinger","orcid":"0000−0002−2985−7724","last_name":"Henzinger"},{"first_name":"Ritankar","last_name":"Majumdar","full_name":"Majumdar, Ritankar S"},{"full_name":"Stoelinga, Mariëlle","last_name":"Stoelinga","first_name":"Mariëlle"}],"extern":1,"date_updated":"2021-01-12T07:59:37Z","citation":{"ista":"Chatterjee K, De Alfaro L, Faella M, Henzinger TA, Majumdar R, Stoelinga M. 2006. Compositional quantitative reasoning. QEST: Quantitative Evaluation of Systems, 179–188.","chicago":"Chatterjee, Krishnendu, Luca De Alfaro, Marco Faella, Thomas A Henzinger, Ritankar Majumdar, and Mariëlle Stoelinga. “Compositional Quantitative Reasoning,” 179–88. IEEE, 2006. https://doi.org/10.1109/QEST.2006.11.","ieee":"K. Chatterjee, L. De Alfaro, M. Faella, T. A. Henzinger, R. Majumdar, and M. Stoelinga, “Compositional quantitative reasoning,” presented at the QEST: Quantitative Evaluation of Systems, 2006, pp. 179–188.","short":"K. Chatterjee, L. De Alfaro, M. Faella, T.A. Henzinger, R. Majumdar, M. Stoelinga, in:, IEEE, 2006, pp. 179–188.","apa":"Chatterjee, K., De Alfaro, L., Faella, M., Henzinger, T. A., Majumdar, R., & Stoelinga, M. (2006). Compositional quantitative reasoning (pp. 179–188). Presented at the QEST: Quantitative Evaluation of Systems, IEEE. https://doi.org/10.1109/QEST.2006.11","ama":"Chatterjee K, De Alfaro L, Faella M, Henzinger TA, Majumdar R, Stoelinga M. Compositional quantitative reasoning. In: IEEE; 2006:179-188. doi:10.1109/QEST.2006.11","mla":"Chatterjee, Krishnendu, et al. Compositional Quantitative Reasoning. IEEE, 2006, pp. 179–88, doi:10.1109/QEST.2006.11."},"status":"public","conference":{"name":"QEST: Quantitative Evaluation of Systems"},"type":"conference","_id":"4549","date_created":"2018-12-11T12:09:26Z","date_published":"2006-09-01T00:00:00Z","doi":"10.1109/QEST.2006.11","page":"179 - 188","day":"01","publication_status":"published","year":"2006","month":"09","publisher":"IEEE","quality_controlled":0,"acknowledgement":"Supported in part by the NSF grants CCR-0234690, CCR-0208875, and CCR-0225610; by the NSF grant CCR-0132780 and ARP grant SC20051123.","abstract":[{"lang":"eng","text":"We present a compositional theory of system verification, where specifications assign real-numbered costs to systems. These costs can express a wide variety of quantitative system properties, such as resource consumption, price, or a measure of how well a system satisfies its specification. The theory supports the composition of systems and specifications, and the hiding of variables. Boolean refinement relations are replaced by real-numbered distances between descriptions of a system at different levels of detail. We show that the classical Boolean rules for compositional reasoning have quantitative counterparts in our setting. While our general theory allows costs to be specified by arbitrary cost functions, we also consider a class of linear cost functions, which give rise to an instance of our framework where all operations are computable in polynomial time."}]},{"_id":"4552","type":"conference","conference":{"name":"QEST: Quantitative Evaluation of Systems"},"status":"public","date_updated":"2021-01-12T07:59:39Z","citation":{"chicago":"Chatterjee, Krishnendu, Luca De Alfaro, and Thomas A Henzinger. “Strategy Improvement for Concurrent Reachability Games,” 291–300. IEEE, 2006. https://doi.org/10.1109/QEST.2006.48.","ista":"Chatterjee K, De Alfaro L, Henzinger TA. 2006. Strategy improvement for concurrent reachability games. QEST: Quantitative Evaluation of Systems, 291–300.","mla":"Chatterjee, Krishnendu, et al. Strategy Improvement for Concurrent Reachability Games. IEEE, 2006, pp. 291–300, doi:10.1109/QEST.2006.48.","ama":"Chatterjee K, De Alfaro L, Henzinger TA. Strategy improvement for concurrent reachability games. In: IEEE; 2006:291-300. doi:10.1109/QEST.2006.48","apa":"Chatterjee, K., De Alfaro, L., & Henzinger, T. A. (2006). Strategy improvement for concurrent reachability games (pp. 291–300). Presented at the QEST: Quantitative Evaluation of Systems, IEEE. https://doi.org/10.1109/QEST.2006.48","short":"K. Chatterjee, L. De Alfaro, T.A. Henzinger, in:, IEEE, 2006, pp. 291–300.","ieee":"K. Chatterjee, L. De Alfaro, and T. A. Henzinger, “Strategy improvement for concurrent reachability games,” presented at the QEST: Quantitative Evaluation of Systems, 2006, pp. 291–300."},"extern":1,"publist_id":"162","author":[{"last_name":"Chatterjee","orcid":"0000-0002-4561-241X","full_name":"Krishnendu Chatterjee","first_name":"Krishnendu","id":"2E5DCA20-F248-11E8-B48F-1D18A9856A87"},{"full_name":"de Alfaro, Luca","last_name":"De Alfaro","first_name":"Luca"},{"full_name":"Thomas Henzinger","orcid":"0000−0002−2985−7724","last_name":"Henzinger","first_name":"Thomas A","id":"40876CD8-F248-11E8-B48F-1D18A9856A87"}],"title":"Strategy improvement for concurrent reachability games","abstract":[{"lang":"eng","text":"A concurrent reachability game is a two-player game played on a graph: at each state, the players simultaneously and independently select moves; the two moves determine jointly a probability distribution over the successor states. The objective for player 1 consists in reaching a set of target states; the objective for player 2 is to prevent this, so that the game is zero-sum. Our contributions are two-fold. First, we present a simple proof of the fact that in concurrent reachability games, for all epsilon > 0, memoryless epsilon-optimal strategies exist. A memoryless strategy is independent of the history of plays, and an epsilon-optimal strategy achieves the objective with probability within epsilon of the value of the game. In contrast to previous proofs of this fact, which rely on the limit behavior of discounted games using advanced Puisieux series analysis, our proof is elementary and combinatorial. Second, we present a strategy-improvement (a.k.a. policy-iteration) algorithm for concurrent games with reachability objectives."}],"quality_controlled":0,"publisher":"IEEE","month":"01","publication_status":"published","year":"2006","day":"01","page":"291 - 300","date_published":"2006-01-01T00:00:00Z","doi":"10.1109/QEST.2006.48","date_created":"2018-12-11T12:09:26Z"},{"extern":1,"citation":{"ista":"Beyer D, Henzinger TA, Théoduloz G. 2006. Lazy shape analysis. CAV: Computer Aided Verification, LNCS, vol. 4144, 532–546.","chicago":"Beyer, Dirk, Thomas A Henzinger, and Grégory Théoduloz. “Lazy Shape Analysis,” 4144:532–46. Springer, 2006. https://doi.org/10.1007/11817963_48.","apa":"Beyer, D., Henzinger, T. A., & Théoduloz, G. (2006). Lazy shape analysis (Vol. 4144, pp. 532–546). Presented at the CAV: Computer Aided Verification, Springer. https://doi.org/10.1007/11817963_48","ama":"Beyer D, Henzinger TA, Théoduloz G. Lazy shape analysis. In: Vol 4144. Springer; 2006:532-546. doi:10.1007/11817963_48","short":"D. Beyer, T.A. Henzinger, G. Théoduloz, in:, Springer, 2006, pp. 532–546.","ieee":"D. Beyer, T. A. Henzinger, and G. Théoduloz, “Lazy shape analysis,” presented at the CAV: Computer Aided Verification, 2006, vol. 4144, pp. 532–546.","mla":"Beyer, Dirk, et al. Lazy Shape Analysis. Vol. 4144, Springer, 2006, pp. 532–46, doi:10.1007/11817963_48."},"date_updated":"2021-01-12T07:59:49Z","title":"Lazy shape analysis","publist_id":"133","author":[{"first_name":"Dirk","last_name":"Beyer","full_name":"Beyer, Dirk"},{"last_name":"Henzinger","full_name":"Thomas Henzinger","orcid":"0000−0002−2985−7724","id":"40876CD8-F248-11E8-B48F-1D18A9856A87","first_name":"Thomas A"},{"first_name":"Grégory","last_name":"Théoduloz","full_name":"Théoduloz, Grégory"}],"_id":"4574","status":"public","conference":{"name":"CAV: Computer Aided Verification"},"type":"conference","day":"08","year":"2006","publication_status":"published","date_created":"2018-12-11T12:09:33Z","doi":"10.1007/11817963_48","volume":4144,"date_published":"2006-08-08T00:00:00Z","page":"532 - 546","abstract":[{"text":"Many software model checkers are based on predicate abstraction. If the verification goal depends on pointer structures, the approach does not work well, because it is difficult to find adequate predicate abstractions for the heap. In contrast, shape analysis, which uses graph-based heap abstractions, can provide a compact representation of recursive data structures. We integrate shape analysis into the software model checker Blast. Because shape analysis is expensive, we do not apply it globally. Instead, we ensure that, like predicates, shape graphs are computed and stored locally, only where necessary for proving the verification goal. To achieve this, we extend lazy abstraction refinement, which so far has been used only for predicate abstractions, to three-valued logical structures. This approach does not only increase the precision of model checking, but it also increases the efficiency of shape analysis. We implemented the technique by extending Blast with calls to Tvla.","lang":"eng"}],"intvolume":" 4144","month":"08","publisher":"Springer","alternative_title":["LNCS"],"quality_controlled":0},{"citation":{"ista":"Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. 2006. Counterfactual computation revisited.","chicago":"Hosten, Onur, Matthew Rakher, Julio Barreiro, Nicholas Peters, and Paul Kwiat. “Counterfactual Computation Revisited.” ArXiv, 2006.","ieee":"O. Hosten, M. Rakher, J. Barreiro, N. Peters, and P. Kwiat, “Counterfactual computation revisited.” ArXiv, 2006.","short":"O. Hosten, M. Rakher, J. Barreiro, N. Peters, P. Kwiat, (2006).","ama":"Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. Counterfactual computation revisited. 2006.","apa":"Hosten, O., Rakher, M., Barreiro, J., Peters, N., & Kwiat, P. (2006). Counterfactual computation revisited. ArXiv.","mla":"Hosten, Onur, et al. Counterfactual Computation Revisited. ArXiv, 2006."},"date_updated":"2020-05-12T08:23:52Z","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publist_id":"7241","author":[{"last_name":"Hosten","full_name":"Hosten, Onur","orcid":"0000-0002-2031-204X","first_name":"Onur","id":"4C02D85E-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Matthew","last_name":"Rakher","full_name":"Rakher, Matthew"},{"last_name":"Barreiro","full_name":"Barreiro, Julio","first_name":"Julio"},{"last_name":"Peters","full_name":"Peters, Nicholas","first_name":"Nicholas"},{"first_name":"Paul","full_name":"Kwiat, Paul","last_name":"Kwiat"}],"external_id":{"arxiv":["0607101"]},"article_processing_charge":"No","title":"Counterfactual computation revisited","_id":"573","type":"preprint","status":"public","publication_status":"published","year":"2006","day":"06","language":[{"iso":"eng"}],"page":"12","date_published":"2006-08-06T00:00:00Z","date_created":"2018-12-11T11:47:16Z","abstract":[{"lang":"eng","text":"Mitchison and Jozsa recently suggested that the "chained-Zeno" counterfactual computation protocol recently proposed by Hosten et al. is counterfactual for only one output of the computer. This claim was based on the existing abstract algebraic definition of counterfactual computation, and indeed according to this definition, their argument is correct. However, a more general definition (physically adequate) for counterfactual computation is implicitly assumed by Hosten et. al. Here we explain in detail why the protocol is counterfactual and how the "history tracking" method of the existing description inadequately represents the physics underlying the protocol. Consequently, we propose a modified definition of counterfactual computation. Finally, we comment on one of the most interesting aspects of the error-correcting protocol. "}],"oa_version":"Preprint","publisher":"ArXiv","main_file_link":[{"url":"https://arxiv.org/abs/quant-ph/0607101","open_access":"1"}],"oa":1,"month":"08"},{"date_created":"2018-12-11T11:47:16Z","date_published":"2006-12-19T00:00:00Z","page":"2","language":[{"iso":"eng"}],"day":"19","publication_status":"published","year":"2006","month":"12","oa":1,"main_file_link":[{"url":"https://arxiv.org/abs/quant-ph/0612159","open_access":"1"}],"publisher":"ArXiv","oa_version":"Preprint","abstract":[{"lang":"eng","text":"Vaidman, in a recent article adopts the method of 'quantum weak measurements in pre- and postselected ensembles' to ascertain whether or not the chained-Zeno counterfactual computation scheme proposed by Hosten et al. is counterfactual; which has been the topic of a debate on the definition of counterfactuality. We disagree with his conclusion, which brings up some interesting aspects of quantum weak measurements and some concerns about the way they are interpreted. "}],"title":"Weak measurements and counterfactual computation","external_id":{"arxiv":["0612159"]},"article_processing_charge":"No","publist_id":"7240","author":[{"full_name":"Hosten, Onur","orcid":"0000-0002-2031-204X","last_name":"Hosten","id":"4C02D85E-F248-11E8-B48F-1D18A9856A87","first_name":"Onur"},{"first_name":"Paul","full_name":"Kwiat, Paul","last_name":"Kwiat"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","date_updated":"2020-05-12T08:18:01Z","citation":{"ista":"Hosten O, Kwiat P. 2006. Weak measurements and counterfactual computation.","chicago":"Hosten, Onur, and Paul Kwiat. “Weak Measurements and Counterfactual Computation.” ArXiv, 2006.","apa":"Hosten, O., & Kwiat, P. (2006). Weak measurements and counterfactual computation. ArXiv.","ama":"Hosten O, Kwiat P. Weak measurements and counterfactual computation. 2006.","ieee":"O. Hosten and P. Kwiat, “Weak measurements and counterfactual computation.” ArXiv, 2006.","short":"O. Hosten, P. Kwiat, (2006).","mla":"Hosten, Onur, and Paul Kwiat. Weak Measurements and Counterfactual Computation. ArXiv, 2006."},"status":"public","type":"preprint","_id":"574"},{"_id":"578","status":"public","conference":{"name":"Quantum Communications and Quantum Imaging"},"type":"conference","extern":1,"citation":{"chicago":"Peters, Nicholas, Keith Arnold, Aaron Vandevender, Evan Jeffrey, Radhika Rangarajan, Onur Hosten, Julio Barreiro, Joseph Altepeter, and Paul Kwiat. “Towards a Quasi-Deterministic Single-Photon Source,” Vol. 6305. SPIE, 2006. https://doi.org/10.1117/12.684702.","ista":"Peters N, Arnold K, Vandevender A, Jeffrey E, Rangarajan R, Hosten O, Barreiro J, Altepeter J, Kwiat P. 2006. Towards a quasi-deterministic single-photon source. Quantum Communications and Quantum Imaging, Proc. SPIE, vol. 6305.","mla":"Peters, Nicholas, et al. Towards a Quasi-Deterministic Single-Photon Source. Vol. 6305, SPIE, 2006, doi:10.1117/12.684702.","ieee":"N. Peters et al., “Towards a quasi-deterministic single-photon source,” presented at the Quantum Communications and Quantum Imaging, 2006, vol. 6305.","short":"N. Peters, K. Arnold, A. Vandevender, E. Jeffrey, R. Rangarajan, O. Hosten, J. Barreiro, J. Altepeter, P. Kwiat, in:, SPIE, 2006.","apa":"Peters, N., Arnold, K., Vandevender, A., Jeffrey, E., Rangarajan, R., Hosten, O., … Kwiat, P. (2006). Towards a quasi-deterministic single-photon source (Vol. 6305). Presented at the Quantum Communications and Quantum Imaging, SPIE. https://doi.org/10.1117/12.684702","ama":"Peters N, Arnold K, Vandevender A, et al. Towards a quasi-deterministic single-photon source. In: Vol 6305. SPIE; 2006. doi:10.1117/12.684702"},"date_updated":"2020-07-14T12:47:11Z","title":"Towards a quasi-deterministic single-photon source","publist_id":"7234","author":[{"last_name":"Peters","full_name":"Peters, Nicholas A","first_name":"Nicholas"},{"first_name":"Keith","last_name":"Arnold","full_name":"Arnold, Keith J"},{"first_name":"Aaron","full_name":"VanDevender, Aaron P","last_name":"Vandevender"},{"first_name":"Evan","full_name":"Jeffrey, Evan R","last_name":"Jeffrey"},{"last_name":"Rangarajan","full_name":"Rangarajan, Radhika","first_name":"Radhika"},{"orcid":"0000-0002-2031-204X","full_name":"Onur Hosten","last_name":"Hosten","id":"4C02D85E-F248-11E8-B48F-1D18A9856A87","first_name":"Onur"},{"last_name":"Barreiro","full_name":"Barreiro, Julio T","first_name":"Julio"},{"first_name":"Joseph","full_name":"Altepeter, Joseph B","last_name":"Altepeter"},{"last_name":"Kwiat","full_name":"Kwiat, Paul G","first_name":"Paul"}],"abstract":[{"text":"A source of single photons allows secure quantum key distribution, in addition, to being a critical resource for linear optics quantum computing. We describe our progress on deterministically creating single photons from spontaneous parametric downconversion, an extension of the Pittman, Jacobs and Franson scheme [Phys. Rev A, v66, 042303 (2002)]. Their idea was to conditionally prepare single photons by measuring one member of a spontaneously emitted photon pair and storing the remaining conditionally prepared photon until a predetermined time, when it would be "deterministically" released from storage. Our approach attempts to improve upon this by recycling the pump pulse in order to decrease the possibility of multiple-pair generation, while maintaining a high probability of producing a single pair. Many of the challenges we discuss are central to other quantum information technologies, including the need for low-loss optical storage, switching and detection, and fast feed-forward control.","lang":"eng"}],"intvolume":" 6305","month":"01","alternative_title":["Proc. SPIE"],"quality_controlled":0,"publisher":"SPIE","day":"01","year":"2006","publication_status":"published","date_created":"2018-12-11T11:47:17Z","doi":"10.1117/12.684702","volume":6305,"date_published":"2006-01-01T00:00:00Z"},{"title":"High-efficiency single-photon detectors","publist_id":"7233","author":[{"full_name":"Rangarajan, Radhika","last_name":"Rangarajan","first_name":"Radhika"},{"full_name":"Altepeter, Joseph B","last_name":"Altepeter","first_name":"Joseph"},{"first_name":"Evan","last_name":"Jeffrey","full_name":"Jeffrey, Evan R"},{"first_name":"Micah","full_name":"Stoutimore, Micah J","last_name":"Stoutimore"},{"first_name":"Nicholas","last_name":"Peters","full_name":"Peters, Nicholas A"},{"full_name":"Onur Hosten","orcid":"0000-0002-2031-204X","last_name":"Hosten","id":"4C02D85E-F248-11E8-B48F-1D18A9856A87","first_name":"Onur"},{"first_name":"Paul","full_name":"Kwiat, Paul G","last_name":"Kwiat"}],"extern":1,"date_updated":"2020-07-14T12:47:11Z","citation":{"ista":"Rangarajan R, Altepeter J, Jeffrey E, Stoutimore M, Peters N, Hosten O, Kwiat P. 2006. High-efficiency single-photon detectors. Unknown (978-081946470-5), Proceedings of SPIE, vol. 6372.","chicago":"Rangarajan, Radhika, Joseph Altepeter, Evan Jeffrey, Micah Stoutimore, Nicholas Peters, Onur Hosten, and Paul Kwiat. “High-Efficiency Single-Photon Detectors,” Vol. 6372. SPIE, 2006. https://doi.org/10.1117/12.686117.","ieee":"R. Rangarajan et al., “High-efficiency single-photon detectors,” presented at the Unknown (978-081946470-5), 2006, vol. 6372.","short":"R. Rangarajan, J. Altepeter, E. Jeffrey, M. Stoutimore, N. Peters, O. Hosten, P. Kwiat, in:, SPIE, 2006.","ama":"Rangarajan R, Altepeter J, Jeffrey E, et al. High-efficiency single-photon detectors. In: Vol 6372. SPIE; 2006. doi:10.1117/12.686117","apa":"Rangarajan, R., Altepeter, J., Jeffrey, E., Stoutimore, M., Peters, N., Hosten, O., & Kwiat, P. (2006). High-efficiency single-photon detectors (Vol. 6372). Presented at the Unknown (978-081946470-5), SPIE. https://doi.org/10.1117/12.686117","mla":"Rangarajan, Radhika, et al. High-Efficiency Single-Photon Detectors. Vol. 6372, SPIE, 2006, doi:10.1117/12.686117."},"status":"public","type":"conference","conference":{"name":"Unknown (978-081946470-5)"},"_id":"577","volume":6372,"doi":"10.1117/12.686117","date_published":"2006-01-01T00:00:00Z","date_created":"2018-12-11T11:47:17Z","day":"01","publication_status":"published","year":"2006","month":"01","intvolume":" 6372","publisher":"SPIE","quality_controlled":0,"alternative_title":["Proceedings of SPIE"],"abstract":[{"text":"Visible light photon counters (VLPCs) and solid-state photomultipliers (SSPMs) are high-efficiency single-photon detectors which have multi-photon counting capability. While both the VLPCs and the SSPMs have inferred internal quantum efficiencies above 93%, the actual measured values for both the detectors were in fact limited to less than 88%, attributed to in-coupling losses. We are currently improving this overall detection efficiency via a) custom anti-reflection coating the detectors and the in-coupling fibers, b) implementing a novel cryogenic design to reduce transmission losses and, c) using low-noise electronics to obtain a better signal-to-noise ratio.","lang":"eng"}]},{"status":"public","type":"journal_article","_id":"579","title":"Counterfactual quantum computation through quantum interrogation","publist_id":"7235","author":[{"last_name":"Hosten","orcid":"0000-0002-2031-204X","full_name":"Onur Hosten","id":"4C02D85E-F248-11E8-B48F-1D18A9856A87","first_name":"Onur"},{"last_name":"Rakher","full_name":"Rakher, Matthew T","first_name":"Matthew"},{"first_name":"Julio","full_name":"Barreiro, Julio T","last_name":"Barreiro"},{"first_name":"Nicholas","full_name":"Peters, Nicholas A","last_name":"Peters"},{"first_name":"Paul","last_name":"Kwiat","full_name":"Kwiat, Paul G"}],"extern":1,"citation":{"ista":"Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. 2006. Counterfactual quantum computation through quantum interrogation. Nature. 439(7079), 949–952.","chicago":"Hosten, Onur, Matthew Rakher, Julio Barreiro, Nicholas Peters, and Paul Kwiat. “Counterfactual Quantum Computation through Quantum Interrogation.” Nature. Nature Publishing Group, 2006. https://doi.org/10.1038/nature04523.","ieee":"O. Hosten, M. Rakher, J. Barreiro, N. Peters, and P. Kwiat, “Counterfactual quantum computation through quantum interrogation,” Nature, vol. 439, no. 7079. Nature Publishing Group, pp. 949–952, 2006.","short":"O. Hosten, M. Rakher, J. Barreiro, N. Peters, P. Kwiat, Nature 439 (2006) 949–952.","apa":"Hosten, O., Rakher, M., Barreiro, J., Peters, N., & Kwiat, P. (2006). Counterfactual quantum computation through quantum interrogation. Nature. Nature Publishing Group. https://doi.org/10.1038/nature04523","ama":"Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. Counterfactual quantum computation through quantum interrogation. Nature. 2006;439(7079):949-952. doi:10.1038/nature04523","mla":"Hosten, Onur, et al. “Counterfactual Quantum Computation through Quantum Interrogation.” Nature, vol. 439, no. 7079, Nature Publishing Group, 2006, pp. 949–52, doi:10.1038/nature04523."},"date_updated":"2021-01-12T08:03:29Z","month":"02","intvolume":" 439","publisher":"Nature Publishing Group","quality_controlled":0,"abstract":[{"lang":"eng","text":"The logic underlying the coherent nature of quantum information processing often deviates from intuitive reasoning, leading to surprising effects. Counterfactual computation constitutes a striking example: the potential outcome of a quantum computation can be inferred, even if the computer is not run 1. Relying on similar arguments to interaction-free measurements 2 (or quantum interrogation3), counterfactual computation is accomplished by putting the computer in a superposition of 'running' and 'not running' states, and then interfering the two histories. Conditional on the as-yet-unknown outcome of the computation, it is sometimes possible to counterfactually infer information about the solution. Here we demonstrate counterfactual computation, implementing Grover's search algorithm with an all-optical approach4. It was believed that the overall probability of such counterfactual inference is intrinsically limited1,5, so that it could not perform better on average than random guesses. However, using a novel 'chained' version of the quantum Zeno effect6, we show how to boost the counterfactual inference probability to unity, thereby beating the random guessing limit. Our methods are general and apply to any physical system, as illustrated by a discussion of trapped-ion systems. Finally, we briefly show that, in certain circumstances, counterfactual computation can eliminate errors induced by decoherence. "}],"doi":"10.1038/nature04523","volume":439,"date_published":"2006-02-23T00:00:00Z","issue":"7079","date_created":"2018-12-11T11:47:18Z","page":"949 - 952","day":"23","publication":"Nature","publication_status":"published","year":"2006"},{"abstract":[{"lang":"eng","text":"Visible light photon counters (VLPCs) and solid-state photomultipliers (SSPMs) facilitate efficient single-photon detection. We are attempting to improve their efficiency, previously limited to < 88% by coupling losses, via anti-reflection coatings, better electronics and cryogenics."}],"month":"01","quality_controlled":0,"publisher":"IEEE","day":"01","year":"2006","publication_status":"published","doi":"10.1109/CLEO.2006.4628641","date_published":"2006-01-01T00:00:00Z","date_created":"2018-12-11T11:47:19Z","_id":"583","status":"public","type":"conference","conference":{"name":"CLEO/QELS: Conference on Lasers and Electro-Optics / Quantum Electronics and Laser Science Conference"},"extern":1,"date_updated":"2021-01-12T08:03:43Z","citation":{"mla":"Rangarajan, Radhika, et al. Improved Single-Photon Detection. IEEE, 2006, doi:10.1109/CLEO.2006.4628641.","short":"R. Rangarajan, N. Peters, O. Hosten, J. Altepeter, E. Jeffrey, P. Kwiat, in:, IEEE, 2006.","ieee":"R. Rangarajan, N. Peters, O. Hosten, J. Altepeter, E. Jeffrey, and P. Kwiat, “Improved single-photon detection,” presented at the CLEO/QELS: Conference on Lasers and Electro-Optics / Quantum Electronics and Laser Science Conference, 2006.","apa":"Rangarajan, R., Peters, N., Hosten, O., Altepeter, J., Jeffrey, E., & Kwiat, P. (2006). Improved single-photon detection. Presented at the CLEO/QELS: Conference on Lasers and Electro-Optics / Quantum Electronics and Laser Science Conference, IEEE. https://doi.org/10.1109/CLEO.2006.4628641","ama":"Rangarajan R, Peters N, Hosten O, Altepeter J, Jeffrey E, Kwiat P. Improved single-photon detection. In: IEEE; 2006. doi:10.1109/CLEO.2006.4628641","chicago":"Rangarajan, Radhika, Nicholas Peters, Onur Hosten, Joseph Altepeter, Evan Jeffrey, and Paul Kwiat. “Improved Single-Photon Detection.” IEEE, 2006. https://doi.org/10.1109/CLEO.2006.4628641.","ista":"Rangarajan R, Peters N, Hosten O, Altepeter J, Jeffrey E, Kwiat P. 2006. Improved single-photon detection. CLEO/QELS: Conference on Lasers and Electro-Optics / Quantum Electronics and Laser Science Conference."},"title":"Improved single-photon detection","author":[{"last_name":"Rangarajan","full_name":"Rangarajan, Radhika","first_name":"Radhika"},{"full_name":"Peters, Nicholas A","last_name":"Peters","first_name":"Nicholas"},{"full_name":"Onur Hosten","orcid":"0000-0002-2031-204X","last_name":"Hosten","id":"4C02D85E-F248-11E8-B48F-1D18A9856A87","first_name":"Onur"},{"last_name":"Altepeter","full_name":"Altepeter, Joseph B","first_name":"Joseph"},{"first_name":"Evan","last_name":"Jeffrey","full_name":"Jeffrey, Evan R"},{"full_name":"Kwiat, Paul G","last_name":"Kwiat","first_name":"Paul"}],"publist_id":"7232"},{"publisher":"Wiley","quality_controlled":"1","oa":1,"main_file_link":[{"url":"https://europepmc.org/articles/pmc1479602","open_access":"1"}],"month":"06","intvolume":" 7","pmid":1,"oa_version":"Published Version","page":"585-589","date_published":"2006-06-01T00:00:00Z","doi":"10.1038/sj.embor.7400713","issue":"6","volume":7,"date_created":"2019-03-21T08:50:43Z","publication_identifier":{"issn":["1469-221X","1469-3178"]},"year":"2006","publication_status":"published","day":"01","publication":"EMBO reports","language":[{"iso":"eng"}],"type":"journal_article","status":"public","_id":"6151","author":[{"full_name":"Salecker, Iris","last_name":"Salecker","first_name":"Iris"},{"first_name":"Michael","full_name":"Häusser, Michael","last_name":"Häusser"},{"first_name":"Mario","id":"4E3FF80E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-8347-0443","full_name":"de Bono, Mario","last_name":"de Bono"}],"external_id":{"pmid":["16729018"]},"title":"On the axonal road to circuit function and behaviour: Workshop on the assembly and function of neuronal circuits","citation":{"ama":"Salecker I, Häusser M, de Bono M. On the axonal road to circuit function and behaviour: Workshop on the assembly and function of neuronal circuits. EMBO reports. 2006;7(6):585-589. doi:10.1038/sj.embor.7400713","apa":"Salecker, I., Häusser, M., & de Bono, M. (2006). On the axonal road to circuit function and behaviour: Workshop on the assembly and function of neuronal circuits. EMBO Reports. Wiley. https://doi.org/10.1038/sj.embor.7400713","ieee":"I. Salecker, M. Häusser, and M. de Bono, “On the axonal road to circuit function and behaviour: Workshop on the assembly and function of neuronal circuits,” EMBO reports, vol. 7, no. 6. Wiley, pp. 585–589, 2006.","short":"I. Salecker, M. Häusser, M. de Bono, EMBO Reports 7 (2006) 585–589.","mla":"Salecker, Iris, et al. “On the Axonal Road to Circuit Function and Behaviour: Workshop on the Assembly and Function of Neuronal Circuits.” EMBO Reports, vol. 7, no. 6, Wiley, 2006, pp. 585–89, doi:10.1038/sj.embor.7400713.","ista":"Salecker I, Häusser M, de Bono M. 2006. On the axonal road to circuit function and behaviour: Workshop on the assembly and function of neuronal circuits. EMBO reports. 7(6), 585–589.","chicago":"Salecker, Iris, Michael Häusser, and Mario de Bono. “On the Axonal Road to Circuit Function and Behaviour: Workshop on the Assembly and Function of Neuronal Circuits.” EMBO Reports. Wiley, 2006. https://doi.org/10.1038/sj.embor.7400713."},"date_updated":"2021-01-12T08:06:23Z","extern":"1","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87"},{"day":"04","publication":"Current Biology","language":[{"iso":"eng"}],"publication_identifier":{"issn":["0960-9822"]},"publication_status":"published","year":"2006","date_published":"2006-04-04T00:00:00Z","doi":"10.1016/j.cub.2006.03.023","volume":16,"issue":"7","date_created":"2019-03-21T09:15:27Z","page":"649-659","pmid":1,"oa_version":"None","month":"04","intvolume":" 16","publisher":"Elsevier","quality_controlled":"1","extern":"1","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","date_updated":"2021-01-12T08:06:23Z","citation":{"ista":"Rogers C, Persson A, Cheung B, de Bono M. 2006. Behavioral motifs and neural pathways coordinating O2 responses and aggregation in C. elegans. Current Biology. 16(7), 649–659.","chicago":"Rogers, Candida, Annelie Persson, Benny Cheung, and Mario de Bono. “Behavioral Motifs and Neural Pathways Coordinating O2 Responses and Aggregation in C. Elegans.” Current Biology. Elsevier, 2006. https://doi.org/10.1016/j.cub.2006.03.023.","ieee":"C. Rogers, A. Persson, B. Cheung, and M. de Bono, “Behavioral motifs and neural pathways coordinating O2 responses and aggregation in C. elegans,” Current Biology, vol. 16, no. 7. Elsevier, pp. 649–659, 2006.","short":"C. Rogers, A. Persson, B. Cheung, M. de Bono, Current Biology 16 (2006) 649–659.","ama":"Rogers C, Persson A, Cheung B, de Bono M. Behavioral motifs and neural pathways coordinating O2 responses and aggregation in C. elegans. Current Biology. 2006;16(7):649-659. doi:10.1016/j.cub.2006.03.023","apa":"Rogers, C., Persson, A., Cheung, B., & de Bono, M. (2006). Behavioral motifs and neural pathways coordinating O2 responses and aggregation in C. elegans. Current Biology. Elsevier. https://doi.org/10.1016/j.cub.2006.03.023","mla":"Rogers, Candida, et al. “Behavioral Motifs and Neural Pathways Coordinating O2 Responses and Aggregation in C. Elegans.” Current Biology, vol. 16, no. 7, Elsevier, 2006, pp. 649–59, doi:10.1016/j.cub.2006.03.023."},"title":"Behavioral motifs and neural pathways coordinating O2 responses and aggregation in C. elegans","author":[{"full_name":"Rogers, Candida","last_name":"Rogers","first_name":"Candida"},{"full_name":"Persson, Annelie","last_name":"Persson","first_name":"Annelie"},{"last_name":"Cheung","full_name":"Cheung, Benny","first_name":"Benny"},{"full_name":"de Bono, Mario","orcid":"0000-0001-8347-0443","last_name":"de Bono","first_name":"Mario","id":"4E3FF80E-F248-11E8-B48F-1D18A9856A87"}],"external_id":{"pmid":["16581509"]},"_id":"6152","status":"public","type":"journal_article"},{"publication_status":"published","year":"2006","publication_identifier":{"issn":["0013-4651"]},"publication":"Journal of The Electrochemical Society","language":[{"iso":"eng"}],"day":"20","date_created":"2020-01-15T12:23:12Z","date_published":"2006-09-20T00:00:00Z","issue":"11","volume":153,"doi":"10.1149/1.2345591","abstract":[{"text":"An experimental technique for measuring the current density distribution with a resolution smaller than the channel/rib scale of the flow field in polymer electrolyte fuel cells (PEFCs) is presented. The electron conductors in a plane perpendicular to the channel direction are considered as two-dimensional resistors. Hence, the current density is obtained from the solution of Laplace's equation with the potentials at current collector and reaction layer as boundary conditions. Using ohmic drop for calculating the local current, detailed knowledge of all resistances involved is of prime importance. In particular, the contact resistance between the gas diffusion layer (GDL) and flow field rib, as well as GDL bulk conductivity, are strongly dependent on clamping pressure. They represent a substantial amount of the total ohmic drop and therefore require careful consideration. The detailed experimental setup as well as the concise procedure for quantitative data evaluation is described. Finally, the method is applied successfully to a cell operated on pure oxygen and air up to high current densities. The results show that electrical and ionic resistances seem to govern the current distribution at low current regimes, whereas mass transport limitations locally hamper the current production at high loads.","lang":"eng"}],"oa_version":"None","publisher":"The Electrochemical Society","quality_controlled":"1","intvolume":" 153","month":"09","citation":{"short":"S.A. Freunberger, M. Reum, J. Evertz, A. Wokaun, F.N. Büchi, Journal of The Electrochemical Society 153 (2006).","ieee":"S. A. Freunberger, M. Reum, J. Evertz, A. Wokaun, and F. N. Büchi, “Measuring the current distribution in PEFCs with sub-millimeter resolution,” Journal of The Electrochemical Society, vol. 153, no. 11. The Electrochemical Society, 2006.","ama":"Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical Society. 2006;153(11). doi:10.1149/1.2345591","apa":"Freunberger, S. A., Reum, M., Evertz, J., Wokaun, A., & Büchi, F. N. (2006). Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2345591","mla":"Freunberger, Stefan Alexander, et al. “Measuring the Current Distribution in PEFCs with Sub-Millimeter Resolution.” Journal of The Electrochemical Society, vol. 153, no. 11, A2158, The Electrochemical Society, 2006, doi:10.1149/1.2345591.","ista":"Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. 2006. Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical Society. 153(11), A2158.","chicago":"Freunberger, Stefan Alexander, Mathias Reum, Jörg Evertz, Alexander Wokaun, and Felix N. Büchi. “Measuring the Current Distribution in PEFCs with Sub-Millimeter Resolution.” Journal of The Electrochemical Society. The Electrochemical Society, 2006. https://doi.org/10.1149/1.2345591."},"date_updated":"2021-01-12T08:13:06Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","article_processing_charge":"No","author":[{"id":"A8CA28E6-CE23-11E9-AD2D-EC27E6697425","first_name":"Stefan Alexander","orcid":"0000-0003-2902-5319","full_name":"Freunberger, Stefan Alexander","last_name":"Freunberger"},{"last_name":"Reum","full_name":"Reum, Mathias","first_name":"Mathias"},{"first_name":"Jörg","last_name":"Evertz","full_name":"Evertz, Jörg"},{"first_name":"Alexander","full_name":"Wokaun, Alexander","last_name":"Wokaun"},{"first_name":"Felix N.","last_name":"Büchi","full_name":"Büchi, Felix N."}],"title":"Measuring the current distribution in PEFCs with sub-millimeter resolution","_id":"7328","article_number":"A2158","article_type":"original","type":"journal_article","status":"public"},{"date_created":"2020-01-15T12:22:56Z","doi":"10.1016/j.jpowsour.2006.06.007","issue":"2","date_published":"2006-10-27T00:00:00Z","volume":161,"page":"1076-1083","language":[{"iso":"eng"}],"publication":"Journal of Power Sources","day":"27","publication_status":"published","year":"2006","publication_identifier":{"issn":["0378-7753"]},"intvolume":" 161","month":"10","publisher":"Elsevier","oa_version":"None","abstract":[{"lang":"eng","text":"Propagation of performance changes to adjacent cells in polymer electrolyte fuel cell stacks is studied by means of voltage monitoring and local current density measurements in peripheral cells of the stack. A technical fuel cell stack has been modified by implementing two independent reactant and coolant supplies in order to deliberately change the performance of one cell (anomalous cell) and study the coupling phenomena to adjacent cells (coupling cells), while keeping the working conditions of the later cell-group unaltered.\r\nTwo anomalies are studied: (i) air starvation and (ii) thermal anomaly, in a single anomalous cell in the stack and their coupling to adjacent cells. The results have shown that anomalies inducing considerable changes in the local current density of the anomalous cell (such as air starvation) propagate to adjacent cells affecting their performance. The propagation of local current density changes takes place via the common bipolar plate due to its finite thickness and in-plane conductivity. Consequently, anomalies which do not strongly influence the local current density distribution (such as a thermal anomaly under the studied working conditions) do not propagate to adjacent cells."}],"title":"Experimental investigation of coupling phenomena in polymer electrolyte fuel cell stacks","article_processing_charge":"No","author":[{"full_name":"Santis, Marco","last_name":"Santis","first_name":"Marco"},{"full_name":"Freunberger, Stefan Alexander","orcid":"0000-0003-2902-5319","last_name":"Freunberger","first_name":"Stefan Alexander","id":"A8CA28E6-CE23-11E9-AD2D-EC27E6697425"},{"first_name":"Matthias","full_name":"Papra, Matthias","last_name":"Papra"},{"last_name":"Wokaun","full_name":"Wokaun, Alexander","first_name":"Alexander"},{"first_name":"Felix N.","last_name":"Büchi","full_name":"Büchi, Felix N."}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","citation":{"mla":"Santis, Marco, et al. “Experimental Investigation of Coupling Phenomena in Polymer Electrolyte Fuel Cell Stacks.” Journal of Power Sources, vol. 161, no. 2, Elsevier, 2006, pp. 1076–83, doi:10.1016/j.jpowsour.2006.06.007.","ieee":"M. Santis, S. A. Freunberger, M. Papra, A. Wokaun, and F. N. Büchi, “Experimental investigation of coupling phenomena in polymer electrolyte fuel cell stacks,” Journal of Power Sources, vol. 161, no. 2. Elsevier, pp. 1076–1083, 2006.","short":"M. Santis, S.A. Freunberger, M. Papra, A. Wokaun, F.N. Büchi, Journal of Power Sources 161 (2006) 1076–1083.","ama":"Santis M, Freunberger SA, Papra M, Wokaun A, Büchi FN. Experimental investigation of coupling phenomena in polymer electrolyte fuel cell stacks. Journal of Power Sources. 2006;161(2):1076-1083. doi:10.1016/j.jpowsour.2006.06.007","apa":"Santis, M., Freunberger, S. A., Papra, M., Wokaun, A., & Büchi, F. N. (2006). Experimental investigation of coupling phenomena in polymer electrolyte fuel cell stacks. Journal of Power Sources. Elsevier. https://doi.org/10.1016/j.jpowsour.2006.06.007","chicago":"Santis, Marco, Stefan Alexander Freunberger, Matthias Papra, Alexander Wokaun, and Felix N. Büchi. “Experimental Investigation of Coupling Phenomena in Polymer Electrolyte Fuel Cell Stacks.” Journal of Power Sources. Elsevier, 2006. https://doi.org/10.1016/j.jpowsour.2006.06.007.","ista":"Santis M, Freunberger SA, Papra M, Wokaun A, Büchi FN. 2006. Experimental investigation of coupling phenomena in polymer electrolyte fuel cell stacks. Journal of Power Sources. 161(2), 1076–1083."},"date_updated":"2021-01-12T08:13:06Z","status":"public","article_type":"original","type":"journal_article","_id":"7327"},{"_id":"7326","status":"public","conference":{"name":"ECS Meeting","end_date":"2006-11-03","location":"Cancun, Mexico","start_date":"2006-10-29"},"type":"conference","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","date_updated":"2021-01-12T08:13:05Z","citation":{"ista":"Büchi FN, Freunberger SA, Santis M. 2006. What is learned beyond the scale of single cells? ECS Transactions. ECS Meeting vol. 3, 963–968.","chicago":"Büchi, Felix N., Stefan Alexander Freunberger, and Marco Santis. “What Is Learned beyond the Scale of Single Cells?” In ECS Transactions, 3:963–68. ECS, 2006. https://doi.org/10.1149/1.2356215.","ama":"Büchi FN, Freunberger SA, Santis M. What is learned beyond the scale of single cells? In: ECS Transactions. Vol 3. ECS; 2006:963-968. doi:10.1149/1.2356215","apa":"Büchi, F. N., Freunberger, S. A., & Santis, M. (2006). What is learned beyond the scale of single cells? In ECS Transactions (Vol. 3, pp. 963–968). Cancun, Mexico: ECS. https://doi.org/10.1149/1.2356215","ieee":"F. N. Büchi, S. A. Freunberger, and M. Santis, “What is learned beyond the scale of single cells?,” in ECS Transactions, Cancun, Mexico, 2006, vol. 3, no. 1, pp. 963–968.","short":"F.N. Büchi, S.A. Freunberger, M. Santis, in:, ECS Transactions, ECS, 2006, pp. 963–968.","mla":"Büchi, Felix N., et al. “What Is Learned beyond the Scale of Single Cells?” ECS Transactions, vol. 3, no. 1, ECS, 2006, pp. 963–68, doi:10.1149/1.2356215."},"title":"What is learned beyond the scale of single cells?","article_processing_charge":"No","author":[{"first_name":"Felix N.","full_name":"Büchi, Felix N.","last_name":"Büchi"},{"last_name":"Freunberger","orcid":"0000-0003-2902-5319","full_name":"Freunberger, Stefan Alexander","first_name":"Stefan Alexander","id":"A8CA28E6-CE23-11E9-AD2D-EC27E6697425"},{"first_name":"Marco","full_name":"Santis, Marco","last_name":"Santis"}],"oa_version":"None","abstract":[{"lang":"eng","text":"Often the properties of a single cell are considered as representative for a complete polymer electrolyte fuel cell stack or even a fuel cell system. In some cases this comes close, however, in many real cases differences on several scales become important. Cell interaction phenomena in fuel cell stacks that arise from inequalities between adjacent cells are investigated in detail experimentally. For that, a specialized 2-cell stack with advanced localized diagnostics was developed. The results show that inequalities propagate by electrical coupling, inhomogeneous cell polarization and inducing in-plane current in the common bipolar plate. The effects of the different loss-mechanisms are analyzed and quantified. "}],"intvolume":" 3","month":"11","publisher":"ECS","quality_controlled":"1","publication":"ECS Transactions","language":[{"iso":"eng"}],"day":"03","year":"2006","publication_status":"published","date_created":"2020-01-15T12:22:44Z","volume":3,"issue":"1","doi":"10.1149/1.2356215","date_published":"2006-11-03T00:00:00Z","page":"963-968"},{"date_updated":"2021-01-12T08:13:06Z","citation":{"mla":"Freunberger, Stefan Alexander, et al. “Expanding Current Distribution Measurement in PEFCs to Sub-Millimeter Resolution.” Electrochemistry Communications, vol. 8, no. 9, Elsevier, 2006, pp. 1435–38, doi:10.1016/j.elecom.2006.05.032.","ieee":"S. A. Freunberger, M. Reum, A. Wokaun, and F. N. Büchi, “Expanding current distribution measurement in PEFCs to sub-millimeter resolution,” Electrochemistry Communications, vol. 8, no. 9. Elsevier, pp. 1435–1438, 2006.","short":"S.A. Freunberger, M. Reum, A. Wokaun, F.N. Büchi, Electrochemistry Communications 8 (2006) 1435–1438.","ama":"Freunberger SA, Reum M, Wokaun A, Büchi FN. Expanding current distribution measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications. 2006;8(9):1435-1438. doi:10.1016/j.elecom.2006.05.032","apa":"Freunberger, S. A., Reum, M., Wokaun, A., & Büchi, F. N. (2006). Expanding current distribution measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications. Elsevier. https://doi.org/10.1016/j.elecom.2006.05.032","chicago":"Freunberger, Stefan Alexander, Mathias Reum, Alexander Wokaun, and Felix N. Büchi. “Expanding Current Distribution Measurement in PEFCs to Sub-Millimeter Resolution.” Electrochemistry Communications. Elsevier, 2006. https://doi.org/10.1016/j.elecom.2006.05.032.","ista":"Freunberger SA, Reum M, Wokaun A, Büchi FN. 2006. Expanding current distribution measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications. 8(9), 1435–1438."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","article_processing_charge":"No","author":[{"last_name":"Freunberger","orcid":"0000-0003-2902-5319","full_name":"Freunberger, Stefan Alexander","first_name":"Stefan Alexander","id":"A8CA28E6-CE23-11E9-AD2D-EC27E6697425"},{"last_name":"Reum","full_name":"Reum, Mathias","first_name":"Mathias"},{"first_name":"Alexander","full_name":"Wokaun, Alexander","last_name":"Wokaun"},{"first_name":"Felix N.","last_name":"Büchi","full_name":"Büchi, Felix N."}],"title":"Expanding current distribution measurement in PEFCs to sub-millimeter resolution","_id":"7329","article_type":"original","type":"journal_article","status":"public","publication_status":"published","year":"2006","publication_identifier":{"issn":["1388-2481"]},"publication":"Electrochemistry Communications","language":[{"iso":"eng"}],"day":"01","page":"1435-1438","date_created":"2020-01-15T12:23:22Z","doi":"10.1016/j.elecom.2006.05.032","volume":8,"issue":"9","date_published":"2006-09-01T00:00:00Z","abstract":[{"lang":"eng","text":"A novel measurement principle for measuring the current distribution in polymer electrolyte fuel cells (PEFCs) is introduced. It allows, in contrast to all other known techniques, for the first time for a resolution smaller than the channel/rib scale of the flow field in PEFCs. The current density is obtained by considering the electron conductors in the cell as a two-dimensional resistor with the voltage drop caused by the current. The method was applied to a cell operated on oxygen up to high current densities. The results show that the ohmic resistances govern the current distribution in the low current regime, whereas mass transport limitations hamper the current production under the land at high loads."}],"oa_version":"None","publisher":"Elsevier","quality_controlled":"1","intvolume":" 8","month":"09"},{"abstract":[{"lang":"eng","text":"Polymer electrolyte fuel cells (PE fuel cells) working with air at low stoichiometries (<2.0) and standard electrochemical components show a high degree of inhomogeneity in the current density distribution over the active area. An inhomogeneous current density distribution leads to a non-uniform utilization of the active area, which could negatively affect the time of life of the cells. Furthermore, it is also believed to lower cell performance. In this work, the homogenization of the current density, realized by means of tailored cathodes with along-the-air-channel redistributed catalyst loadings, is investigated. The air stoichiometry range for which a homogenization of the current density is achieved depends upon the gradient with which the catalyst is redistributed along the air channel. A gentle increasing catalyst loading profile homogenizes the current density at relatively higher air stoichiometries, while a steeper profile is suited better for lower air stoichiometries. The results show that a homogenization of the current density by means of redistributed catalyst loading has negative effects on cell performance. Model calculations corroborate the experimental findings on homogenization of the current density and deliver an explanation for the decrease in cell performance."}],"oa_version":"None","publisher":"Elsevier","quality_controlled":"1","month":"07","intvolume":" 51","publication_identifier":{"issn":["0013-4686"]},"year":"2006","publication_status":"published","day":"01","publication":"Electrochimica Acta","language":[{"iso":"eng"}],"page":"5383-5393","volume":51,"issue":"25","date_published":"2006-07-01T00:00:00Z","doi":"10.1016/j.electacta.2006.02.008","date_created":"2020-01-15T12:23:34Z","_id":"7330","type":"journal_article","article_type":"original","status":"public","citation":{"ista":"Santis M, Freunberger SA, Reiner A, Büchi FN. 2006. Homogenization of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst gradients. Electrochimica Acta. 51(25), 5383–5393.","chicago":"Santis, M., Stefan Alexander Freunberger, A. Reiner, and F.N. Büchi. “Homogenization of the Current Density in Polymer Electrolyte Fuel Cells by In-Plane Cathode Catalyst Gradients.” Electrochimica Acta. Elsevier, 2006. https://doi.org/10.1016/j.electacta.2006.02.008.","apa":"Santis, M., Freunberger, S. A., Reiner, A., & Büchi, F. N. (2006). Homogenization of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst gradients. Electrochimica Acta. Elsevier. https://doi.org/10.1016/j.electacta.2006.02.008","ama":"Santis M, Freunberger SA, Reiner A, Büchi FN. Homogenization of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst gradients. Electrochimica Acta. 2006;51(25):5383-5393. doi:10.1016/j.electacta.2006.02.008","short":"M. Santis, S.A. Freunberger, A. Reiner, F.N. Büchi, Electrochimica Acta 51 (2006) 5383–5393.","ieee":"M. Santis, S. A. Freunberger, A. Reiner, and F. N. Büchi, “Homogenization of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst gradients,” Electrochimica Acta, vol. 51, no. 25. Elsevier, pp. 5383–5393, 2006.","mla":"Santis, M., et al. “Homogenization of the Current Density in Polymer Electrolyte Fuel Cells by In-Plane Cathode Catalyst Gradients.” Electrochimica Acta, vol. 51, no. 25, Elsevier, 2006, pp. 5383–93, doi:10.1016/j.electacta.2006.02.008."},"date_updated":"2021-01-12T08:13:07Z","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"M.","full_name":"Santis, M.","last_name":"Santis"},{"last_name":"Freunberger","full_name":"Freunberger, Stefan Alexander","orcid":"0000-0003-2902-5319","first_name":"Stefan Alexander","id":"A8CA28E6-CE23-11E9-AD2D-EC27E6697425"},{"last_name":"Reiner","full_name":"Reiner, A.","first_name":"A."},{"last_name":"Büchi","full_name":"Büchi, F.N.","first_name":"F.N."}],"article_processing_charge":"No","title":"Homogenization of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst gradients"},{"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","date_updated":"2021-01-12T08:13:08Z","citation":{"mla":"Freunberger, Stefan Alexander, et al. “In-Plane Effects in Large-Scale PEMFCs.” Journal of The Electrochemical Society, vol. 153, no. 2, A396, The Electrochemical Society, 2006, doi:10.1149/1.2150150.","ieee":"S. A. Freunberger, M. Santis, I. A. Schneider, A. Wokaun, and F. N. Büchi, “In-plane effects in large-scale PEMFCs,” Journal of The Electrochemical Society, vol. 153, no. 2. The Electrochemical Society, 2006.","short":"S.A. Freunberger, M. Santis, I.A. Schneider, A. Wokaun, F.N. Büchi, Journal of The Electrochemical Society 153 (2006).","ama":"Freunberger SA, Santis M, Schneider IA, Wokaun A, Büchi FN. In-plane effects in large-scale PEMFCs. Journal of The Electrochemical Society. 2006;153(2). doi:10.1149/1.2150150","apa":"Freunberger, S. A., Santis, M., Schneider, I. A., Wokaun, A., & Büchi, F. N. (2006). In-plane effects in large-scale PEMFCs. Journal of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2150150","chicago":"Freunberger, Stefan Alexander, Marco Santis, Ingo A. Schneider, Alexander Wokaun, and Felix N. Büchi. “In-Plane Effects in Large-Scale PEMFCs.” Journal of The Electrochemical Society. The Electrochemical Society, 2006. https://doi.org/10.1149/1.2150150.","ista":"Freunberger SA, Santis M, Schneider IA, Wokaun A, Büchi FN. 2006. In-plane effects in large-scale PEMFCs. Journal of The Electrochemical Society. 153(2), A396."},"title":"In-plane effects in large-scale PEMFCs","article_processing_charge":"No","author":[{"orcid":"0000-0003-2902-5319","full_name":"Freunberger, Stefan Alexander","last_name":"Freunberger","first_name":"Stefan Alexander","id":"A8CA28E6-CE23-11E9-AD2D-EC27E6697425"},{"full_name":"Santis, Marco","last_name":"Santis","first_name":"Marco"},{"first_name":"Ingo A.","full_name":"Schneider, Ingo A.","last_name":"Schneider"},{"first_name":"Alexander","full_name":"Wokaun, Alexander","last_name":"Wokaun"},{"first_name":"Felix N.","last_name":"Büchi","full_name":"Büchi, Felix N."}],"article_number":"A396","_id":"7332","status":"public","type":"journal_article","article_type":"original","language":[{"iso":"eng"}],"publication":"Journal of The Electrochemical Society","day":"04","year":"2006","publication_status":"published","publication_identifier":{"issn":["0013-4651"]},"date_created":"2020-01-15T12:24:00Z","issue":"2","volume":153,"date_published":"2006-01-04T00:00:00Z","doi":"10.1149/1.2150150","oa_version":"None","abstract":[{"lang":"eng","text":"A quasi-two-dimensional, along-the-channel mass and heat-transfer model for a proton exchange membrane fuel cell (PEFC) is described and validated against experimental current distribution data. The model is formulated in a dimensional manner, i.e., local transport phenomena are treated one-dimensional in through-plane direction and coupled in-plane by convective transport in the gas and coolant channels. Thus, a two-dimensional slice running through the repetitive unit of a cell from the anode channel via membrane-electrode assembly (MEA) and cathode channel to the coolant channel and from inlet to outlet is modeled. The aim of the work is to elucidate the influence of operating conditions such as feed gas humidities and stoichiometric ratios on the along-the-channel current density distribution and to identify the distinct underlying voltage loss mechanisms. Furthermore, a complicated technical flow field is modeled by a combination of co- and counterflow subdomains and compared with experimental current densities."}],"intvolume":" 153","month":"01","publisher":"The Electrochemical Society","quality_controlled":"1"},{"article_number":"A909","_id":"7331","status":"public","article_type":"original","type":"journal_article","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Freunberger SA, Wokaun A, Büchi FN. 2006. In-plane effects in large-scale PEFCs: II. The influence of cooling strategy on cell performance. Journal of The Electrochemical Society. 153(5), A909.","chicago":"Freunberger, Stefan Alexander, Alexander Wokaun, and Felix N. Büchi. “In-Plane Effects in Large-Scale PEFCs: II. The Influence of Cooling Strategy on Cell Performance.” Journal of The Electrochemical Society. The Electrochemical Society, 2006. https://doi.org/10.1149/1.2185282.","ama":"Freunberger SA, Wokaun A, Büchi FN. In-plane effects in large-scale PEFCs: II. The influence of cooling strategy on cell performance. Journal of The Electrochemical Society. 2006;153(5). doi:10.1149/1.2185282","apa":"Freunberger, S. A., Wokaun, A., & Büchi, F. N. (2006). In-plane effects in large-scale PEFCs: II. The influence of cooling strategy on cell performance. Journal of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2185282","short":"S.A. Freunberger, A. Wokaun, F.N. Büchi, Journal of The Electrochemical Society 153 (2006).","ieee":"S. A. Freunberger, A. Wokaun, and F. N. Büchi, “In-plane effects in large-scale PEFCs: II. The influence of cooling strategy on cell performance,” Journal of The Electrochemical Society, vol. 153, no. 5. The Electrochemical Society, 2006.","mla":"Freunberger, Stefan Alexander, et al. “In-Plane Effects in Large-Scale PEFCs: II. The Influence of Cooling Strategy on Cell Performance.” Journal of The Electrochemical Society, vol. 153, no. 5, A909, The Electrochemical Society, 2006, doi:10.1149/1.2185282."},"date_updated":"2021-01-12T08:13:08Z","title":"In-plane effects in large-scale PEFCs: II. The influence of cooling strategy on cell performance","author":[{"first_name":"Stefan Alexander","id":"A8CA28E6-CE23-11E9-AD2D-EC27E6697425","full_name":"Freunberger, Stefan Alexander","orcid":"0000-0003-2902-5319","last_name":"Freunberger"},{"full_name":"Wokaun, Alexander","last_name":"Wokaun","first_name":"Alexander"},{"first_name":"Felix N.","last_name":"Büchi","full_name":"Büchi, Felix N."}],"article_processing_charge":"No","oa_version":"None","abstract":[{"text":"A previously developed mathematical model for water management and current density distribution in a polymer electrolyte fuel cell (PEFCs) is employed to investigate the effects of cooling strategies on cell performance. The model describes a two-dimensional slice through the cell along the channels and through the entire cell sandwich including the coolant channels and the bipolar plate. Arbitrary flow arrangements of fuel, oxidant, and coolant stream directions can be described. Due to the serious impact of temperature on all processes in the PEFC, both the relative direction of the coolant stream to the gas streams and its mass flow turns out to significantly affect the cell performance. Besides influencing the electrochemical reaction and all kinds of mass transfer temperature, variations predominantly alter the local membrane hydration distribution and subseqently its conductivity.","lang":"eng"}],"month":"03","intvolume":" 153","publisher":"The Electrochemical Society","quality_controlled":"1","day":"27","language":[{"iso":"eng"}],"publication":"Journal of The Electrochemical Society","publication_identifier":{"issn":["0013-4651"]},"year":"2006","publication_status":"published","date_published":"2006-03-27T00:00:00Z","issue":"5","volume":153,"doi":"10.1149/1.2185282","date_created":"2020-01-15T12:23:46Z"},{"_id":"854","status":"public","type":"journal_article","extern":1,"citation":{"short":"E. Rogaev, Y. Moliaka, B. Malyarchuk, F. Kondrashov, M. Derenko, I. Chumakov, A. Grigorenko, PLoS Biology 4 (2006) 0403–0410.","ieee":"E. Rogaev et al., “Complete mitochondrial genome and phylogeny of pleistocene mammoth Mammuthus primigenius,” PLoS Biology, vol. 4, no. 3. Public Library of Science, pp. 0403–0410, 2006.","apa":"Rogaev, E., Moliaka, Y., Malyarchuk, B., Kondrashov, F., Derenko, M., Chumakov, I., & Grigorenko, A. (2006). Complete mitochondrial genome and phylogeny of pleistocene mammoth Mammuthus primigenius. PLoS Biology. Public Library of Science. https://doi.org/10.1371/journal.pbio.0040073","ama":"Rogaev E, Moliaka Y, Malyarchuk B, et al. Complete mitochondrial genome and phylogeny of pleistocene mammoth Mammuthus primigenius. PLoS Biology. 2006;4(3):0403-0410. doi:10.1371/journal.pbio.0040073","mla":"Rogaev, Evgeny, et al. “Complete Mitochondrial Genome and Phylogeny of Pleistocene Mammoth Mammuthus Primigenius.” PLoS Biology, vol. 4, no. 3, Public Library of Science, 2006, pp. 0403–10, doi:10.1371/journal.pbio.0040073.","ista":"Rogaev E, Moliaka Y, Malyarchuk B, Kondrashov F, Derenko M, Chumakov I, Grigorenko A. 2006. Complete mitochondrial genome and phylogeny of pleistocene mammoth Mammuthus primigenius. PLoS Biology. 4(3), 0403–0410.","chicago":"Rogaev, Evgeny, Yuri Moliaka, Boris Malyarchuk, Fyodor Kondrashov, Miroslava Derenko, Ilya Chumakov, and Anastasia Grigorenko. “Complete Mitochondrial Genome and Phylogeny of Pleistocene Mammoth Mammuthus Primigenius.” PLoS Biology. Public Library of Science, 2006. https://doi.org/10.1371/journal.pbio.0040073."},"date_updated":"2021-01-12T08:19:58Z","title":"Complete mitochondrial genome and phylogeny of pleistocene mammoth Mammuthus primigenius","author":[{"first_name":"Evgeny","full_name":"Rogaev, Evgeny I","last_name":"Rogaev"},{"first_name":"Yuri","full_name":"Moliaka, Yuri K","last_name":"Moliaka"},{"first_name":"Boris","last_name":"Malyarchuk","full_name":"Malyarchuk, Boris A"},{"last_name":"Kondrashov","full_name":"Fyodor Kondrashov","orcid":"0000-0001-8243-4694","first_name":"Fyodor","id":"44FDEF62-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Miroslava","full_name":"Derenko, Miroslava V","last_name":"Derenko"},{"last_name":"Chumakov","full_name":"Chumakov, Ilya M","first_name":"Ilya"},{"full_name":"Grigorenko, Anastasia P","last_name":"Grigorenko","first_name":"Anastasia"}],"publist_id":"6794","acknowledgement":"FAK is supported by the NSF Graduate Research Fellowship.\nWe thank the Natural History Museum, North-Eastern Research Center, Far Eastern Branch of the Russian Academy of Sciences for photographic material ofM. primigenius leg, V. A. Nikishina for artwork and technical support, Y.B. Yurov, G. Dvoryanchikov, N. Riazanskaya and T. Kolesnikova for technical support, K. Mehren and C. Gray for elephant specimens, and V. Y. Solovyev for help with artwork of animal images.","abstract":[{"lang":"eng","text":"Phylogenetic relationships between the extinct woolly mammoth (Mammuthus primigenius), and the Asian (Elephas maximus) and African savanna (Loxodonta africana) elephants remain unresolved. Here, we report the sequence of the complete mitochondrial genome (16,842 base pairs) of a woolly mammoth extracted from permafrost-preserved remains from the Pleistocene epoch - the oldest mitochondrial genome sequence determined to date. We demonstrate that well-preserved mitochondrial genome fragments, as long as ∼1,600-1700 base pairs, can be retrieved from pre-Holocene remains of an extinct species. Phylogenetic reconstruction of the Elephantinae clade suggests that M. primigenius and E. maximus are sister species that diverged soon after their common ancestor split from the L. africana lineage. Low nucleotide diversity found between independently determined mitochondrial genomic sequences of woolly mammoths separated geographically and in time suggests that north-eastern Siberia was occupied by a relatively homogeneous population of M. primigenius throughout the late Pleistocene."}],"month":"03","intvolume":" 4","publisher":"Public Library of Science","quality_controlled":0,"day":"01","publication":"PLoS Biology","year":"2006","publication_status":"published","date_published":"2006-03-01T00:00:00Z","doi":"10.1371/journal.pbio.0040073","issue":"3","volume":4,"date_created":"2018-12-11T11:48:51Z","page":"0403 - 0410"}]