--- _id: '1778' abstract: - lang: eng text: Creating a train of single photons and monitoring its propagation and interaction is challenging in most physical systems, as photons generally interact very weakly with other systems. However, when confining microwave frequency photons in a transmission line resonator, effective photon-photon interactions can be mediated by qubits embedded in the resonator. Here, we observe the phenomenon of photon blockade through second-order correlation function measurements. The experiments clearly demonstrate antibunching in a continuously pumped source of single microwave photons measured by using microwave beam splitters, linear amplifiers, and quadrature amplitude detectors. We also investigate resonance fluorescence and Rayleigh scattering in Mollow-triplet-like spectra. acknowledgement: This work was supported by the European Research Council (ERC) through a Starting Grant and by ETHZ. M. P. d. S. was supported by NSERC. A. B. was supported by NSERC, CIFAR, and the Alfred P. Sloan Foundation author: - first_name: C full_name: Lang, C last_name: Lang - first_name: Deniz full_name: Bozyigit, Deniz last_name: Bozyigit - first_name: Christopher full_name: Eichler, Christopher last_name: Eichler - first_name: L. full_name: Steffen, L. Kraig last_name: Steffen - first_name: Johannes M full_name: Johannes Fink id: 4B591CBA-F248-11E8-B48F-1D18A9856A87 last_name: Fink orcid: 0000-0001-8112-028X - first_name: Abdufarrukh full_name: Abdumalikov, Abdufarrukh A last_name: Abdumalikov - first_name: Matthias full_name: Baur, Matthias P last_name: Baur - first_name: Stefan full_name: Filipp, Stefan last_name: Filipp - first_name: Marcus full_name: Da Silva, Marcus P last_name: Da Silva - first_name: Alexandre full_name: Blais, Alexandre last_name: Blais - first_name: Andreas full_name: Wallraff, Andreas last_name: Wallraff citation: ama: Lang C, Bozyigit D, Eichler C, et al. Observation of resonant photon blockade at microwave frequencies using correlation function measurements. Physical Review Letters. 2011;106(24). doi:10.1103/PhysRevLett.106.243601 apa: Lang, C., Bozyigit, D., Eichler, C., Steffen, L., Fink, J. M., Abdumalikov, A., … Wallraff, A. (2011). Observation of resonant photon blockade at microwave frequencies using correlation function measurements. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.106.243601 chicago: Lang, C, Deniz Bozyigit, Christopher Eichler, L. Steffen, Johannes M Fink, Abdufarrukh Abdumalikov, Matthias Baur, et al. “Observation of Resonant Photon Blockade at Microwave Frequencies Using Correlation Function Measurements.” Physical Review Letters. American Physical Society, 2011. https://doi.org/10.1103/PhysRevLett.106.243601. ieee: C. Lang et al., “Observation of resonant photon blockade at microwave frequencies using correlation function measurements,” Physical Review Letters, vol. 106, no. 24. American Physical Society, 2011. ista: Lang C, Bozyigit D, Eichler C, Steffen L, Fink JM, Abdumalikov A, Baur M, Filipp S, Da Silva M, Blais A, Wallraff A. 2011. Observation of resonant photon blockade at microwave frequencies using correlation function measurements. Physical Review Letters. 106(24). mla: Lang, C., et al. “Observation of Resonant Photon Blockade at Microwave Frequencies Using Correlation Function Measurements.” Physical Review Letters, vol. 106, no. 24, American Physical Society, 2011, doi:10.1103/PhysRevLett.106.243601. short: C. Lang, D. Bozyigit, C. Eichler, L. Steffen, J.M. Fink, A. Abdumalikov, M. Baur, S. Filipp, M. Da Silva, A. Blais, A. Wallraff, Physical Review Letters 106 (2011). date_created: 2018-12-11T11:53:57Z date_published: 2011-06-15T00:00:00Z date_updated: 2021-01-12T06:53:08Z day: '15' doi: 10.1103/PhysRevLett.106.243601 extern: 1 intvolume: ' 106' issue: '24' main_file_link: - open_access: '1' url: http://arxiv.org/abs/1102.0461 month: '06' oa: 1 publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '5336' quality_controlled: 0 status: public title: Observation of resonant photon blockade at microwave frequencies using correlation function measurements type: journal_article volume: 106 year: '2011' ... --- _id: '1775' abstract: - lang: eng text: At optical frequencies the radiation produced by a source, such as a laser, a black body or a single-photon emitter, is frequently characterized by analysing the temporal correlations of emitted photons using single-photon counters. At microwave frequencies, however, there are no efficient single-photon counters yet. Instead, well-developed linear amplifiers allow for efficient measurement of the amplitude of an electromagnetic field. Here, we demonstrate first- and second-order correlation function measurements of a pulsed microwave-frequency single-photon source integrated on the same chip with a 50/50 beam splitter followed by linear amplifiers and quadrature amplitude detectors. We clearly observe single-photon coherence in first-order and photon antibunching in second-order correlation function measurements of the propagating fields. acknowledgement: This work was supported by the European Research Council (ERC) through a Starting Grant and by ETHZ. M.P.d.S. was supported by a NSERC postdoctoral fellowship. A.B. was supported by NSERC, CIFAR and the Alfred P. Sloan Foundation author: - first_name: Deniz full_name: Bozyigit, Deniz last_name: Bozyigit - first_name: C full_name: Lang, C last_name: Lang - first_name: L. full_name: Steffen, L. Kraig last_name: Steffen - first_name: Johannes M full_name: Johannes Fink id: 4B591CBA-F248-11E8-B48F-1D18A9856A87 last_name: Fink orcid: 0000-0001-8112-028X - first_name: Christopher full_name: Eichler, Christopher last_name: Eichler - first_name: Matthias full_name: Baur, Matthias P last_name: Baur - first_name: R full_name: Bianchetti, R last_name: Bianchetti - first_name: Peter full_name: Leek, Peter J last_name: Leek - first_name: Stefan full_name: Filipp, Stefan last_name: Filipp - first_name: Marcus full_name: Da Silva, Marcus P last_name: Da Silva - first_name: Alexandre full_name: Blais, Alexandre last_name: Blais - first_name: Andreas full_name: Wallraff, Andreas last_name: Wallraff citation: ama: Bozyigit D, Lang C, Steffen L, et al. Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors. Nature Physics. 2011;7(2):154-158. doi:10.1038/nphys1845 apa: Bozyigit, D., Lang, C., Steffen, L., Fink, J. M., Eichler, C., Baur, M., … Wallraff, A. (2011). Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors. Nature Physics. Nature Publishing Group. https://doi.org/10.1038/nphys1845 chicago: Bozyigit, Deniz, C Lang, L. Steffen, Johannes M Fink, Christopher Eichler, Matthias Baur, R Bianchetti, et al. “Antibunching of Microwave-Frequency Photons Observed in Correlation Measurements Using Linear Detectors.” Nature Physics. Nature Publishing Group, 2011. https://doi.org/10.1038/nphys1845. ieee: D. Bozyigit et al., “Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors,” Nature Physics, vol. 7, no. 2. Nature Publishing Group, pp. 154–158, 2011. ista: Bozyigit D, Lang C, Steffen L, Fink JM, Eichler C, Baur M, Bianchetti R, Leek P, Filipp S, Da Silva M, Blais A, Wallraff A. 2011. Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors. Nature Physics. 7(2), 154–158. mla: Bozyigit, Deniz, et al. “Antibunching of Microwave-Frequency Photons Observed in Correlation Measurements Using Linear Detectors.” Nature Physics, vol. 7, no. 2, Nature Publishing Group, 2011, pp. 154–58, doi:10.1038/nphys1845. short: D. Bozyigit, C. Lang, L. Steffen, J.M. Fink, C. Eichler, M. Baur, R. Bianchetti, P. Leek, S. Filipp, M. Da Silva, A. Blais, A. Wallraff, Nature Physics 7 (2011) 154–158. date_created: 2018-12-11T11:53:57Z date_published: 2011-02-01T00:00:00Z date_updated: 2021-01-12T06:53:07Z day: '01' doi: 10.1038/nphys1845 extern: 1 intvolume: ' 7' issue: '2' month: '02' page: 154 - 158 publication: Nature Physics publication_status: published publisher: Nature Publishing Group publist_id: '5340' quality_controlled: 0 status: public title: Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors type: journal_article volume: 7 year: '2011' ... --- _id: '1781' abstract: - lang: eng text: Microwave cavities with high quality factors enable coherent coupling of distant quantum systems. Virtual photons lead to a transverse interaction between qubits when they are nonresonant with the cavity but resonant with each other. We experimentally investigate the inverse scaling of the interqubit coupling with the detuning from a cavity mode and its proportionality to the qubit-cavity interaction strength. We demonstrate that the enhanced coupling at higher frequencies is mediated by multiple higher-harmonic cavity modes. Moreover, we observe dark states of the coupled qubit-qubit system and analyze their relation to the symmetry of the applied driving field at different frequencies. acknowledgement: This work was supported by the Swiss National Science Foundation (SNF), the Austrian Science Foundation (FWF), and ETH Zurich author: - first_name: Stefan full_name: Filipp, Stefan last_name: Filipp - first_name: M full_name: Göppl, M last_name: Göppl - first_name: Johannes M full_name: Johannes Fink id: 4B591CBA-F248-11E8-B48F-1D18A9856A87 last_name: Fink orcid: 0000-0001-8112-028X - first_name: Matthias full_name: Baur, Matthias P last_name: Baur - first_name: R full_name: Bianchetti, R last_name: Bianchetti - first_name: L. full_name: Steffen, L. Kraig last_name: Steffen - first_name: Andreas full_name: Wallraff, Andreas last_name: Wallraff citation: ama: Filipp S, Göppl M, Fink JM, et al. Multimode mediated qubit-qubit coupling and dark-state symmetries in circuit quantum electrodynamics. Physical Review A - Atomic, Molecular, and Optical Physics. 2011;83(6). doi:10.1103/PhysRevA.83.063827 apa: Filipp, S., Göppl, M., Fink, J. M., Baur, M., Bianchetti, R., Steffen, L., & Wallraff, A. (2011). Multimode mediated qubit-qubit coupling and dark-state symmetries in circuit quantum electrodynamics. Physical Review A - Atomic, Molecular, and Optical Physics. American Physical Society. https://doi.org/10.1103/PhysRevA.83.063827 chicago: Filipp, Stefan, M Göppl, Johannes M Fink, Matthias Baur, R Bianchetti, L. Steffen, and Andreas Wallraff. “Multimode Mediated Qubit-Qubit Coupling and Dark-State Symmetries in Circuit Quantum Electrodynamics.” Physical Review A - Atomic, Molecular, and Optical Physics. American Physical Society, 2011. https://doi.org/10.1103/PhysRevA.83.063827. ieee: S. Filipp et al., “Multimode mediated qubit-qubit coupling and dark-state symmetries in circuit quantum electrodynamics,” Physical Review A - Atomic, Molecular, and Optical Physics, vol. 83, no. 6. American Physical Society, 2011. ista: Filipp S, Göppl M, Fink JM, Baur M, Bianchetti R, Steffen L, Wallraff A. 2011. Multimode mediated qubit-qubit coupling and dark-state symmetries in circuit quantum electrodynamics. Physical Review A - Atomic, Molecular, and Optical Physics. 83(6). mla: Filipp, Stefan, et al. “Multimode Mediated Qubit-Qubit Coupling and Dark-State Symmetries in Circuit Quantum Electrodynamics.” Physical Review A - Atomic, Molecular, and Optical Physics, vol. 83, no. 6, American Physical Society, 2011, doi:10.1103/PhysRevA.83.063827. short: S. Filipp, M. Göppl, J.M. Fink, M. Baur, R. Bianchetti, L. Steffen, A. Wallraff, Physical Review A - Atomic, Molecular, and Optical Physics 83 (2011). date_created: 2018-12-11T11:53:58Z date_published: 2011-06-22T00:00:00Z date_updated: 2021-01-12T06:53:09Z day: '22' doi: 10.1103/PhysRevA.83.063827 extern: 1 intvolume: ' 83' issue: '6' month: '06' publication: Physical Review A - Atomic, Molecular, and Optical Physics publication_status: published publisher: American Physical Society publist_id: '5335' quality_controlled: 0 status: public title: Multimode mediated qubit-qubit coupling and dark-state symmetries in circuit quantum electrodynamics type: journal_article volume: 83 year: '2011' ... --- _id: '1780' abstract: - lang: eng text: Continuous variable entanglement between two modes of a radiation field is usually studied at optical frequencies. Here we demonstrate experiments that show the entanglement between microwave photons of different energy in a broadband squeezed beam. We use a Josephson parametric amplifier to generate the two-mode correlated state and detect all four quadrature components simultaneously in a two-channel heterodyne setup using amplitude detectors. Analyzing two-dimensional phase space histograms for all possible pairs of quadratures allows us to determine the full covariance matrix, which is in good agreement with the one expected for a two-mode squeezed state. acknowledgement: This work was supported by the European Research Council (ERC) through a Starting grant and by ETHZ. S. F. acknowledges the Austrian Science Foundation (FWF) for support author: - first_name: Christopher full_name: Eichler, Christopher last_name: Eichler - first_name: Deniz full_name: Bozyigit, Deniz last_name: Bozyigit - first_name: C full_name: Lang, C last_name: Lang - first_name: Matthias full_name: Baur, Matthias P last_name: Baur - first_name: L. full_name: Steffen, L. Kraig last_name: Steffen - first_name: Johannes M full_name: Johannes Fink id: 4B591CBA-F248-11E8-B48F-1D18A9856A87 last_name: Fink orcid: 0000-0001-8112-028X - first_name: Stefan full_name: Filipp, Stefan last_name: Filipp - first_name: Andreas full_name: Wallraff, Andreas last_name: Wallraff citation: ama: Eichler C, Bozyigit D, Lang C, et al. Observation of two-mode squeezing in the microwave frequency domain. Physical Review Letters. 2011;107(11). doi:10.1103/PhysRevLett.107.113601 apa: Eichler, C., Bozyigit, D., Lang, C., Baur, M., Steffen, L., Fink, J. M., … Wallraff, A. (2011). Observation of two-mode squeezing in the microwave frequency domain. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.107.113601 chicago: Eichler, Christopher, Deniz Bozyigit, C Lang, Matthias Baur, L. Steffen, Johannes M Fink, Stefan Filipp, and Andreas Wallraff. “Observation of Two-Mode Squeezing in the Microwave Frequency Domain.” Physical Review Letters. American Physical Society, 2011. https://doi.org/10.1103/PhysRevLett.107.113601. ieee: C. Eichler et al., “Observation of two-mode squeezing in the microwave frequency domain,” Physical Review Letters, vol. 107, no. 11. American Physical Society, 2011. ista: Eichler C, Bozyigit D, Lang C, Baur M, Steffen L, Fink JM, Filipp S, Wallraff A. 2011. Observation of two-mode squeezing in the microwave frequency domain. Physical Review Letters. 107(11). mla: Eichler, Christopher, et al. “Observation of Two-Mode Squeezing in the Microwave Frequency Domain.” Physical Review Letters, vol. 107, no. 11, American Physical Society, 2011, doi:10.1103/PhysRevLett.107.113601. short: C. Eichler, D. Bozyigit, C. Lang, M. Baur, L. Steffen, J.M. Fink, S. Filipp, A. Wallraff, Physical Review Letters 107 (2011). date_created: 2018-12-11T11:53:58Z date_published: 2011-09-06T00:00:00Z date_updated: 2021-01-12T06:53:09Z day: '06' doi: 10.1103/PhysRevLett.107.113601 extern: 1 intvolume: ' 107' issue: '11' month: '09' publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '5334' quality_controlled: 0 status: public title: Observation of two-mode squeezing in the microwave frequency domain type: journal_article volume: 107 year: '2011' ... --- _id: '1815' abstract: - lang: eng text: Many membrane channels and receptors exhibit adaptive, or desensitized, response to a strong sustained input stimulus, often supported by protein activity-dependent inactivation. Adaptive response is thought to be related to various cellular functions such as homeostasis and enlargement of dynamic range by background compensation. Here we study the quantitative relation between adaptive response and background compensation within a modeling framework. We show that any particular type of adaptive response is neither sufficient nor necessary for adaptive enlargement of dynamic range. In particular a precise adaptive response, where system activity is maintained at a constant level at steady state, does not ensure a large dynamic range neither in input signal nor in system output. A general mechanism for input dynamic range enlargement can come about from the activity-dependent modulation of protein responsiveness by multiple biochemical modification, regardless of the type of adaptive response it induces. Therefore hierarchical biochemical processes such as methylation and phosphorylation are natural candidates to induce this property in signaling systems. author: - first_name: Tamar full_name: Tamar Friedlander id: 36A5845C-F248-11E8-B48F-1D18A9856A87 last_name: Friedlander - first_name: Naama full_name: Brenner, Naama last_name: Brenner citation: ama: Friedlander T, Brenner N. Adaptive response and enlargement of dynamic range. Mathematical Biosciences and Engineering. 2011;8(2):515-526. doi:10.3934/mbe.2011.8.515 apa: Friedlander, T., & Brenner, N. (2011). Adaptive response and enlargement of dynamic range. Mathematical Biosciences and Engineering. Arizona State University. https://doi.org/10.3934/mbe.2011.8.515 chicago: Friedlander, Tamar, and Naama Brenner. “Adaptive Response and Enlargement of Dynamic Range.” Mathematical Biosciences and Engineering. Arizona State University, 2011. https://doi.org/10.3934/mbe.2011.8.515. ieee: T. Friedlander and N. Brenner, “Adaptive response and enlargement of dynamic range,” Mathematical Biosciences and Engineering, vol. 8, no. 2. Arizona State University, pp. 515–526, 2011. ista: Friedlander T, Brenner N. 2011. Adaptive response and enlargement of dynamic range. Mathematical Biosciences and Engineering. 8(2), 515–526. mla: Friedlander, Tamar, and Naama Brenner. “Adaptive Response and Enlargement of Dynamic Range.” Mathematical Biosciences and Engineering, vol. 8, no. 2, Arizona State University, 2011, pp. 515–26, doi:10.3934/mbe.2011.8.515. short: T. Friedlander, N. Brenner, Mathematical Biosciences and Engineering 8 (2011) 515–526. date_created: 2018-12-11T11:54:10Z date_published: 2011-04-02T00:00:00Z date_updated: 2021-01-12T06:53:23Z day: '02' doi: 10.3934/mbe.2011.8.515 extern: 1 intvolume: ' 8' issue: '2' main_file_link: - open_access: '1' url: http://arxiv.org/abs/1003.2791 month: '04' oa: 1 page: 515 - 526 publication: Mathematical Biosciences and Engineering publication_status: published publisher: Arizona State University publist_id: '5291' quality_controlled: 0 status: public title: Adaptive response and enlargement of dynamic range type: journal_article volume: 8 year: '2011' ...