--- _id: '14802' abstract: - lang: eng text: Frequency-stable lasers form the back bone of precision measurements in science and technology. Such lasers typically attain their stability through frequency locking to reference cavities. State-of-the-art locking performances to date had been achieved using frequency modulation based methods, complemented with active drift cancellation systems. We demonstrate an all passive, modulation-free laser-cavity locking technique (squash locking) that utilizes changes in spatial beam ellipticity for error signal generation, and a coherent polarization post-selection for noise resilience. By comparing two identically built proof-of-principle systems, we show a frequency locking instability of 5×10−7 relative to the cavity linewidth at 10 s averaging. The results surpass the demonstrated performances of methods engineered over the last five decades, potentially enabling an advancement in the precision control of lasers, while creating avenues for bridging the performance gaps between industrial grade lasers with scientific ones due to the afforded simplicity and scalability. acknowledgement: We thank Rishabh Sahu and Sebastian Wald for technical contributions to the experiment. Funding by Institute of Science and Technology Austria. article_processing_charge: Yes article_type: original author: - first_name: Fritz R full_name: Diorico, Fritz R id: 2E054C4C-F248-11E8-B48F-1D18A9856A87 last_name: Diorico orcid: 0000-0002-4947-8924 - first_name: Artem full_name: Zhutov, Artem id: 0f02ed6a-b514-11ee-b891-8379c5f19cb7 last_name: Zhutov - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X citation: ama: 'Diorico FR, Zhutov A, Hosten O. Laser-cavity locking utilizing beam ellipticity: accessing the 10−7 instability scale relative to cavity linewidth. Optica. 2024;11(1):26-31. doi:10.1364/optica.507451' apa: 'Diorico, F. R., Zhutov, A., & Hosten, O. (2024). Laser-cavity locking utilizing beam ellipticity: accessing the 10−7 instability scale relative to cavity linewidth. Optica. Optica Publishing Group. https://doi.org/10.1364/optica.507451' chicago: 'Diorico, Fritz R, Artem Zhutov, and Onur Hosten. “Laser-Cavity Locking Utilizing Beam Ellipticity: Accessing the 10−7 Instability Scale Relative to Cavity Linewidth.” Optica. Optica Publishing Group, 2024. https://doi.org/10.1364/optica.507451.' ieee: 'F. R. Diorico, A. Zhutov, and O. Hosten, “Laser-cavity locking utilizing beam ellipticity: accessing the 10−7 instability scale relative to cavity linewidth,” Optica, vol. 11, no. 1. Optica Publishing Group, pp. 26–31, 2024.' ista: 'Diorico FR, Zhutov A, Hosten O. 2024. Laser-cavity locking utilizing beam ellipticity: accessing the 10−7 instability scale relative to cavity linewidth. Optica. 11(1), 26–31.' mla: 'Diorico, Fritz R., et al. “Laser-Cavity Locking Utilizing Beam Ellipticity: Accessing the 10−7 Instability Scale Relative to Cavity Linewidth.” Optica, vol. 11, no. 1, Optica Publishing Group, 2024, pp. 26–31, doi:10.1364/optica.507451.' short: F.R. Diorico, A. Zhutov, O. Hosten, Optica 11 (2024) 26–31. date_created: 2024-01-15T10:25:38Z date_published: 2024-01-20T00:00:00Z date_updated: 2024-01-17T08:53:47Z day: '20' ddc: - '530' department: - _id: OnHo doi: 10.1364/optica.507451 file: - access_level: open_access checksum: eb99ca7d0fe73e22f121875175546ed7 content_type: application/pdf creator: dernst date_created: 2024-01-17T08:53:16Z date_updated: 2024-01-17T08:53:16Z file_id: '14824' file_name: 2023_Optica_Diorico.pdf file_size: 4558986 relation: main_file success: 1 file_date_updated: 2024-01-17T08:53:16Z has_accepted_license: '1' intvolume: ' 11' issue: '1' keyword: - Atomic and Molecular Physics - and Optics - Electronic - Optical and Magnetic Materials language: - iso: eng license: https://creativecommons.org/licenses/by/4.0/ month: '01' oa: 1 oa_version: Published Version page: 26-31 publication: Optica publication_identifier: issn: - 2334-2536 publication_status: published publisher: Optica Publishing Group quality_controlled: '1' status: public title: 'Laser-cavity locking utilizing beam ellipticity: accessing the 10−7 instability scale relative to cavity linewidth' tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 11 year: '2024' ... --- _id: '14980' abstract: - lang: eng text: Precision sensing and manipulation of milligram-scale mechanical oscillators has attracted growing interest in the fields of table-top explorations of gravity and tests of quantum mechanics at macroscopic scales. Torsional oscillators present an opportunity in this regard due to their remarked isolation from environmental noise. For torsional motion, an effective employment of optical cavities to enhance optomechanical interactions—as already established for linear oscillators—so far faced certain challenges. Here, we propose a concept for sensing and manipulating torsional motion, where exclusively the torsional rotations of a pendulum are mapped onto the path length of a single two-mirror optical cavity. The concept inherently alleviates many limitations of previous approaches. A proof-of-principle experiment is conducted with a rigidly controlled pendulum to explore the sensing aspects of the concept and to identify practical limitations in a potential state-of-the art setup. Based on this study, we anticipate development of precision torque sensors utilizing torsional pendulums that can support sensitivities below 10−19Nm/√Hz, while the motion of the pendulums are dominated by quantum radiation pressure noise at sub-microwatts of incoming laser power. These developments will provide horizons for experiments at the interface of quantum mechanics and gravity. acknowledgement: "We thank Pere Rosselló for his contributions to the initial modeling of the presented sensing technique. This work was supported by Institute of Science and Technology Austria, and\r\nthe European Research Council under Grant No. 101087907 (ERC CoG QuHAMP)." article_number: '013141' article_processing_charge: Yes article_type: original author: - first_name: Sofya full_name: Agafonova, Sofya id: 09501ff6-dca7-11ea-a8ae-b3e0b9166e80 last_name: Agafonova orcid: 0000-0003-0582-2946 - first_name: Umang full_name: Mishra, Umang id: 4328fa4c-f128-11eb-9611-c107b0fe4d51 last_name: Mishra - first_name: Fritz R full_name: Diorico, Fritz R id: 2E054C4C-F248-11E8-B48F-1D18A9856A87 last_name: Diorico orcid: 0000-0002-4947-8924 - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X citation: ama: Agafonova S, Mishra U, Diorico FR, Hosten O. Zigzag optical cavity for sensing and controlling torsional motion. Physical Review Research. 2024;6(1). doi:10.1103/physrevresearch.6.013141 apa: Agafonova, S., Mishra, U., Diorico, F. R., & Hosten, O. (2024). Zigzag optical cavity for sensing and controlling torsional motion. Physical Review Research. American Physical Society. https://doi.org/10.1103/physrevresearch.6.013141 chicago: Agafonova, Sofya, Umang Mishra, Fritz R Diorico, and Onur Hosten. “Zigzag Optical Cavity for Sensing and Controlling Torsional Motion.” Physical Review Research. American Physical Society, 2024. https://doi.org/10.1103/physrevresearch.6.013141. ieee: S. Agafonova, U. Mishra, F. R. Diorico, and O. Hosten, “Zigzag optical cavity for sensing and controlling torsional motion,” Physical Review Research, vol. 6, no. 1. American Physical Society, 2024. ista: Agafonova S, Mishra U, Diorico FR, Hosten O. 2024. Zigzag optical cavity for sensing and controlling torsional motion. Physical Review Research. 6(1), 013141. mla: Agafonova, Sofya, et al. “Zigzag Optical Cavity for Sensing and Controlling Torsional Motion.” Physical Review Research, vol. 6, no. 1, 013141, American Physical Society, 2024, doi:10.1103/physrevresearch.6.013141. short: S. Agafonova, U. Mishra, F.R. Diorico, O. Hosten, Physical Review Research 6 (2024). date_created: 2024-02-12T11:42:18Z date_published: 2024-02-05T00:00:00Z date_updated: 2024-02-12T11:49:06Z day: '05' ddc: - '530' department: - _id: OnHo doi: 10.1103/physrevresearch.6.013141 external_id: arxiv: - '2306.12804' file: - access_level: open_access checksum: 3a39ebffb24c1cc1dd0b547a726dc52d content_type: application/pdf creator: dernst date_created: 2024-02-12T11:46:50Z date_updated: 2024-02-12T11:46:50Z file_id: '14981' file_name: 2024_PhysicalRevResearch_Agafonova.pdf file_size: 1437167 relation: main_file success: 1 file_date_updated: 2024-02-12T11:46:50Z has_accepted_license: '1' intvolume: ' 6' issue: '1' language: - iso: eng month: '02' oa: 1 oa_version: Published Version project: - _id: bdb2a702-d553-11ed-ba76-f12e3e5a3bc6 grant_number: '101087907' name: 'A quantum hybrid of atoms and milligram-scale pendulums: towards gravitational quantum mechanics' publication: Physical Review Research publication_identifier: eissn: - 2643-1564 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Zigzag optical cavity for sensing and controlling torsional motion tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 6 year: '2024' ... --- _id: '13233' abstract: - lang: eng text: We study the impact of finite-range physics on the zero-range-model analysis of three-body recombination in ultracold atoms. We find that temperature dependence of the zero-range parameters can vary from one set of measurements to another as it may be driven by the distribution of error bars in the experiment, and not by the underlying three-body physics. To study finite-temperature effects in three-body recombination beyond the zero-range physics, we introduce and examine a finite-range model based upon a hyperspherical formalism. The systematic error discussed in this Letter may provide a significant contribution to the error bars of measured three-body parameters. acknowledgement: We thank Jan Arlt, Hans-Werner Hammer, and Karsten Riisager for useful discussions. M.L. acknowledges support by the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). article_number: L061304 article_processing_charge: No article_type: letter_note author: - first_name: Sofya full_name: Agafonova, Sofya id: 09501ff6-dca7-11ea-a8ae-b3e0b9166e80 last_name: Agafonova - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 - first_name: Artem full_name: Volosniev, Artem id: 37D278BC-F248-11E8-B48F-1D18A9856A87 last_name: Volosniev orcid: 0000-0003-0393-5525 citation: ama: Agafonova S, Lemeshko M, Volosniev A. Finite-range bias in fitting three-body loss to the zero-range model. Physical Review A. 2023;107(6). doi:10.1103/PhysRevA.107.L061304 apa: Agafonova, S., Lemeshko, M., & Volosniev, A. (2023). Finite-range bias in fitting three-body loss to the zero-range model. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.107.L061304 chicago: Agafonova, Sofya, Mikhail Lemeshko, and Artem Volosniev. “Finite-Range Bias in Fitting Three-Body Loss to the Zero-Range Model.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.107.L061304. ieee: S. Agafonova, M. Lemeshko, and A. Volosniev, “Finite-range bias in fitting three-body loss to the zero-range model,” Physical Review A, vol. 107, no. 6. American Physical Society, 2023. ista: Agafonova S, Lemeshko M, Volosniev A. 2023. Finite-range bias in fitting three-body loss to the zero-range model. Physical Review A. 107(6), L061304. mla: Agafonova, Sofya, et al. “Finite-Range Bias in Fitting Three-Body Loss to the Zero-Range Model.” Physical Review A, vol. 107, no. 6, L061304, American Physical Society, 2023, doi:10.1103/PhysRevA.107.L061304. short: S. Agafonova, M. Lemeshko, A. Volosniev, Physical Review A 107 (2023). date_created: 2023-07-16T22:01:10Z date_published: 2023-06-20T00:00:00Z date_updated: 2023-08-02T06:31:52Z day: '20' department: - _id: MiLe - _id: OnHo doi: 10.1103/PhysRevA.107.L061304 ec_funded: 1 external_id: arxiv: - '2302.01022' isi: - '001019748000005' intvolume: ' 107' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2302.01022 month: '06' oa: 1 oa_version: Preprint project: - _id: 2688CF98-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '801770' name: 'Angulon: physics and applications of a new quasiparticle' publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Finite-range bias in fitting three-body loss to the zero-range model type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 107 year: '2023' ... --- _id: '13264' abstract: - lang: eng text: "We build a parametric amplifier with a Josephson field-effect transistor (JoFET) as the active element. The resonant frequency of the device is field-effect tunable over a range of 2 GHz. The JoFET amplifier has 20 dB of gain, 4 MHz of instantaneous bandwidth, and a 1-dB compression point of -125.5 dBm when operated at a fixed resonance frequency.\r\n\r\n" acknowledged_ssus: - _id: NanoFab - _id: M-Shop acknowledgement: We thank Shyam Shankar for helpful feedback on the manuscript. We gratefully acknowledge the support of the ISTA nanofabrication facility, the Miba Machine Shop, and the eMachine Shop. The NYU team acknowledges support from Army Research Office Grant No. W911NF2110303. article_number: '064032' article_processing_charge: No article_type: original author: - first_name: Duc T full_name: Phan, Duc T id: 29C8C0B4-F248-11E8-B48F-1D18A9856A87 last_name: Phan - first_name: Paul full_name: Falthansl-Scheinecker, Paul id: 85b43b21-15b2-11ec-abd3-e2c252cc2285 last_name: Falthansl-Scheinecker - first_name: Umang full_name: Mishra, Umang id: 4328fa4c-f128-11eb-9611-c107b0fe4d51 last_name: Mishra - first_name: W. M. full_name: Strickland, W. M. last_name: Strickland - first_name: D. full_name: Langone, D. last_name: Langone - first_name: J. full_name: Shabani, J. last_name: Shabani - first_name: Andrew P full_name: Higginbotham, Andrew P id: 4AD6785A-F248-11E8-B48F-1D18A9856A87 last_name: Higginbotham orcid: 0000-0003-2607-2363 citation: ama: Phan DT, Falthansl-Scheinecker P, Mishra U, et al. Gate-tunable superconductor-semiconductor parametric amplifier. Physical Review Applied. 2023;19(6). doi:10.1103/PhysRevApplied.19.064032 apa: Phan, D. T., Falthansl-Scheinecker, P., Mishra, U., Strickland, W. M., Langone, D., Shabani, J., & Higginbotham, A. P. (2023). Gate-tunable superconductor-semiconductor parametric amplifier. Physical Review Applied. American Physical Society. https://doi.org/10.1103/PhysRevApplied.19.064032 chicago: Phan, Duc T, Paul Falthansl-Scheinecker, Umang Mishra, W. M. Strickland, D. Langone, J. Shabani, and Andrew P Higginbotham. “Gate-Tunable Superconductor-Semiconductor Parametric Amplifier.” Physical Review Applied. American Physical Society, 2023. https://doi.org/10.1103/PhysRevApplied.19.064032. ieee: D. T. Phan et al., “Gate-tunable superconductor-semiconductor parametric amplifier,” Physical Review Applied, vol. 19, no. 6. American Physical Society, 2023. ista: Phan DT, Falthansl-Scheinecker P, Mishra U, Strickland WM, Langone D, Shabani J, Higginbotham AP. 2023. Gate-tunable superconductor-semiconductor parametric amplifier. Physical Review Applied. 19(6), 064032. mla: Phan, Duc T., et al. “Gate-Tunable Superconductor-Semiconductor Parametric Amplifier.” Physical Review Applied, vol. 19, no. 6, 064032, American Physical Society, 2023, doi:10.1103/PhysRevApplied.19.064032. short: D.T. Phan, P. Falthansl-Scheinecker, U. Mishra, W.M. Strickland, D. Langone, J. Shabani, A.P. Higginbotham, Physical Review Applied 19 (2023). date_created: 2023-07-23T22:01:12Z date_published: 2023-06-09T00:00:00Z date_updated: 2023-11-30T10:56:03Z day: '09' department: - _id: AnHi - _id: OnHo doi: 10.1103/PhysRevApplied.19.064032 external_id: arxiv: - '2206.05746' isi: - '001012022600004' intvolume: ' 19' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2206.05746 month: '06' oa: 1 oa_version: Preprint publication: Physical Review Applied publication_identifier: eissn: - 2331-7019 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '14547' relation: dissertation_contains status: public scopus_import: '1' status: public title: Gate-tunable superconductor-semiconductor parametric amplifier type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 19 year: '2023' ... --- _id: '14749' abstract: - lang: eng text: We unveil a powerful method for the stabilization of laser injection locking based on sensing variations in the output beam ellipticity of an optically seeded laser. The effect arises due to an interference between the seeding beam and the injected laser output. We demonstrate the method for a commercial semiconductor laser without the need for any internal changes to the readily operational injection locked laser system that was used. The method can also be used to increase the mode-hop free tuning range of lasers, and has the potential to fill a void in the low-noise laser industry. article_processing_charge: No article_type: original author: - first_name: Umang full_name: Mishra, Umang id: 4328fa4c-f128-11eb-9611-c107b0fe4d51 last_name: Mishra - first_name: Vyacheslav full_name: Li, Vyacheslav id: 3A4FAA92-F248-11E8-B48F-1D18A9856A87 last_name: Li - first_name: Sebastian full_name: Wald, Sebastian id: 133F200A-B015-11E9-AD41-0EDAE5697425 last_name: Wald - first_name: Sofya full_name: Agafonova, Sofya id: 09501ff6-dca7-11ea-a8ae-b3e0b9166e80 last_name: Agafonova orcid: 0000-0003-0582-2946 - first_name: Fritz R full_name: Diorico, Fritz R id: 2E054C4C-F248-11E8-B48F-1D18A9856A87 last_name: Diorico - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X citation: ama: Mishra U, Li V, Wald S, Agafonova S, Diorico FR, Hosten O. Monitoring and active stabilization of laser injection locking using beam ellipticity. Optics Letters. 2023;48(15):3973-3976. doi:10.1364/ol.495553 apa: Mishra, U., Li, V., Wald, S., Agafonova, S., Diorico, F. R., & Hosten, O. (2023). Monitoring and active stabilization of laser injection locking using beam ellipticity. Optics Letters. Optica Publishing Group. https://doi.org/10.1364/ol.495553 chicago: Mishra, Umang, Vyacheslav Li, Sebastian Wald, Sofya Agafonova, Fritz R Diorico, and Onur Hosten. “Monitoring and Active Stabilization of Laser Injection Locking Using Beam Ellipticity.” Optics Letters. Optica Publishing Group, 2023. https://doi.org/10.1364/ol.495553. ieee: U. Mishra, V. Li, S. Wald, S. Agafonova, F. R. Diorico, and O. Hosten, “Monitoring and active stabilization of laser injection locking using beam ellipticity,” Optics Letters, vol. 48, no. 15. Optica Publishing Group, pp. 3973–3976, 2023. ista: Mishra U, Li V, Wald S, Agafonova S, Diorico FR, Hosten O. 2023. Monitoring and active stabilization of laser injection locking using beam ellipticity. Optics Letters. 48(15), 3973–3976. mla: Mishra, Umang, et al. “Monitoring and Active Stabilization of Laser Injection Locking Using Beam Ellipticity.” Optics Letters, vol. 48, no. 15, Optica Publishing Group, 2023, pp. 3973–76, doi:10.1364/ol.495553. short: U. Mishra, V. Li, S. Wald, S. Agafonova, F.R. Diorico, O. Hosten, Optics Letters 48 (2023) 3973–3976. date_created: 2024-01-08T13:01:46Z date_published: 2023-07-21T00:00:00Z date_updated: 2024-01-09T08:09:32Z day: '21' department: - _id: OnHo doi: 10.1364/ol.495553 external_id: arxiv: - '2212.01266' intvolume: ' 48' issue: '15' keyword: - Atomic and Molecular Physics - and Optics language: - iso: eng month: '07' oa_version: Preprint page: 3973-3976 publication: Optics Letters publication_identifier: eissn: - 1539-4794 issn: - 0146-9592 publication_status: published publisher: Optica Publishing Group quality_controlled: '1' scopus_import: '1' status: public title: Monitoring and active stabilization of laser injection locking using beam ellipticity type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 48 year: '2023' ... --- _id: '14759' abstract: - lang: eng text: "Proper operation of electro-optic I/Q modulators relies on precise adjustment and control of the relative phase biases between the modulator’s internal interferometer arms. We present an all-analog phase bias locking scheme where error signals are obtained from the beat between the optical carrier and optical tones generated by an auxiliary 2 MHz \U0001D445\U0001D439 tone to lock the phases of all three involved interferometers for operation up to 10 GHz. With the developed method, we demonstrate an I/Q modulator in carrier-suppressed single-sideband mode, where the suppressed carrier and sideband are locked at optical power levels <−27dB\r\n relative to the transmitted sideband. We describe a simple analytical model for calculating the error signals and detail the implementation of the electronic circuitry for the implementation of the method." acknowledgement: We thank Jakob Vorlaufer for technical contributions and Vyacheslav Li and Sofia Agafonova for comments on the manuscript. article_processing_charge: No article_type: original author: - first_name: Sebastian full_name: Wald, Sebastian id: 133F200A-B015-11E9-AD41-0EDAE5697425 last_name: Wald orcid: 0000-0002-5869-1604 - first_name: Fritz R full_name: Diorico, Fritz R id: 2E054C4C-F248-11E8-B48F-1D18A9856A87 last_name: Diorico orcid: 0000-0002-4947-8924 - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X citation: ama: Wald S, Diorico FR, Hosten O. Analog stabilization of an electro-optic I/Q modulator with an auxiliary modulation tone. Applied Optics. 2023;62(1):1-7. doi:10.1364/ao.474118 apa: Wald, S., Diorico, F. R., & Hosten, O. (2023). Analog stabilization of an electro-optic I/Q modulator with an auxiliary modulation tone. Applied Optics. Optica Publishing Group. https://doi.org/10.1364/ao.474118 chicago: Wald, Sebastian, Fritz R Diorico, and Onur Hosten. “Analog Stabilization of an Electro-Optic I/Q Modulator with an Auxiliary Modulation Tone.” Applied Optics. Optica Publishing Group, 2023. https://doi.org/10.1364/ao.474118. ieee: S. Wald, F. R. Diorico, and O. Hosten, “Analog stabilization of an electro-optic I/Q modulator with an auxiliary modulation tone,” Applied Optics, vol. 62, no. 1. Optica Publishing Group, pp. 1–7, 2023. ista: Wald S, Diorico FR, Hosten O. 2023. Analog stabilization of an electro-optic I/Q modulator with an auxiliary modulation tone. Applied Optics. 62(1), 1–7. mla: Wald, Sebastian, et al. “Analog Stabilization of an Electro-Optic I/Q Modulator with an Auxiliary Modulation Tone.” Applied Optics, vol. 62, no. 1, Optica Publishing Group, 2023, pp. 1–7, doi:10.1364/ao.474118. short: S. Wald, F.R. Diorico, O. Hosten, Applied Optics 62 (2023) 1–7. date_created: 2024-01-08T13:19:14Z date_published: 2023-01-01T00:00:00Z date_updated: 2024-01-09T10:10:34Z day: '01' department: - _id: OnHo doi: 10.1364/ao.474118 external_id: arxiv: - '2208.11591' intvolume: ' 62' issue: '1' keyword: - Atomic and Molecular Physics - and Optics - Engineering (miscellaneous) - Electrical and Electronic Engineering language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2208.11591 month: '01' oa: 1 oa_version: Preprint page: 1-7 publication: Applied Optics publication_identifier: eissn: - 2155-3165 issn: - 1559-128X publication_status: published publisher: Optica Publishing Group quality_controlled: '1' scopus_import: '1' status: public title: Analog stabilization of an electro-optic I/Q modulator with an auxiliary modulation tone type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 62 year: '2023' ... --- _id: '10652' abstract: - lang: eng text: Finding a feasible scheme for testing the quantum mechanical nature of the gravitational interaction has been attracting an increasing level of attention. Gravity mediated entanglement generation so far appears to be the key ingredient for a potential experiment. In a recent proposal [D. Carney et al., PRX Quantum 2, 030330 (2021)] combining an atom interferometer with a low-frequency mechanical oscillator, a coherence revival test is proposed for verifying this entanglement generation. With measurements performed only on the atoms, this protocol bypasses the need for correlation measurements. Here, we explore formulations of such a protocol, and specifically find that in the envisioned regime of operation with high thermal excitation, semiclassical models, where there is no concept of entanglement, also give the same experimental signatures. We elucidate in a fully quantum mechanical calculation that entanglement is not the source of the revivals in the relevant parameter regime. We argue that, in its current form, the suggested test is only relevant if the oscillator is nearly in a pure quantum state, and in this regime the effects are too small to be measurable. We further discuss potential open ends. The results highlight the importance and subtleties of explicitly considering how the quantum case differs from the classical expectations when testing for the quantum mechanical nature of a physical system. acknowledgement: O.H. is supported by Institute of Science and Technology Austria. The author thanks Jess Riedel for discussions. article_number: '013023' article_processing_charge: Yes (via OA deal) article_type: original author: - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X citation: ama: Hosten O. Constraints on probing quantum coherence to infer gravitational entanglement. Physical Review Research. 2022;4(1). doi:10.1103/PhysRevResearch.4.013023 apa: Hosten, O. (2022). Constraints on probing quantum coherence to infer gravitational entanglement. Physical Review Research. American Physical Society. https://doi.org/10.1103/PhysRevResearch.4.013023 chicago: Hosten, Onur. “Constraints on Probing Quantum Coherence to Infer Gravitational Entanglement.” Physical Review Research. American Physical Society, 2022. https://doi.org/10.1103/PhysRevResearch.4.013023. ieee: O. Hosten, “Constraints on probing quantum coherence to infer gravitational entanglement,” Physical Review Research, vol. 4, no. 1. American Physical Society, 2022. ista: Hosten O. 2022. Constraints on probing quantum coherence to infer gravitational entanglement. Physical Review Research. 4(1), 013023. mla: Hosten, Onur. “Constraints on Probing Quantum Coherence to Infer Gravitational Entanglement.” Physical Review Research, vol. 4, no. 1, 013023, American Physical Society, 2022, doi:10.1103/PhysRevResearch.4.013023. short: O. Hosten, Physical Review Research 4 (2022). date_created: 2022-01-23T23:01:27Z date_published: 2022-01-10T00:00:00Z date_updated: 2022-05-16T11:21:38Z day: '10' ddc: - '530' department: - _id: OnHo doi: 10.1103/PhysRevResearch.4.013023 file: - access_level: open_access checksum: 7254d267a0633ca5d63131d345e58686 content_type: application/pdf creator: cchlebak date_created: 2022-01-24T11:12:44Z date_updated: 2022-01-24T11:12:44Z file_id: '10660' file_name: 2022_PhysRevResearch_Hosten.pdf file_size: 236329 relation: main_file success: 1 file_date_updated: 2022-01-24T11:12:44Z has_accepted_license: '1' intvolume: ' 4' issue: '1' language: - iso: eng month: '01' oa: 1 oa_version: Published Version publication: Physical Review Research publication_identifier: issn: - 2643-1564 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Constraints on probing quantum coherence to infer gravitational entanglement tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 4 year: '2022' ... --- _id: '11438' abstract: - lang: eng text: Lasers with well-controlled relative frequencies are indispensable for many applications in science and technology. We present a frequency-offset locking method for lasers based on beat-frequency discrimination utilizing hybrid electronic LC filters. The method is specifically designed for decoupling the tightness of the lock from the broadness of its capture range. The presented demonstration locks two free-running diode lasers at 780 nm with a 5.5-GHz offset. It displays an offset frequency instability below 55 Hz for time scales in excess of 1000 s and a minimum of 12 Hz at 10-s averaging. The performance is complemented with a 190-MHz lock-capture range, a tuning range of up to 1 GHz, and a frequency ramp agility of 200kHz/μs. acknowledgement: This work was supported by IST Austria. The authors thank Yueheng Shi for technical contributions. article_number: '054031' article_processing_charge: No article_type: original author: - first_name: Vyacheslav full_name: Li, Vyacheslav id: 3A4FAA92-F248-11E8-B48F-1D18A9856A87 last_name: Li - first_name: Fritz R full_name: Diorico, Fritz R id: 2E054C4C-F248-11E8-B48F-1D18A9856A87 last_name: Diorico - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X citation: ama: Li V, Diorico FR, Hosten O. Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters. Physical Review Applied. 2022;17(5). doi:10.1103/physrevapplied.17.054031 apa: Li, V., Diorico, F. R., & Hosten, O. (2022). Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters. Physical Review Applied. American Physical Society. https://doi.org/10.1103/physrevapplied.17.054031 chicago: Li, Vyacheslav, Fritz R Diorico, and Onur Hosten. “Laser Frequency-Offset Locking at 10-Hz-Level Instability Using Hybrid Electronic Filters.” Physical Review Applied. American Physical Society, 2022. https://doi.org/10.1103/physrevapplied.17.054031. ieee: V. Li, F. R. Diorico, and O. Hosten, “Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters,” Physical Review Applied, vol. 17, no. 5. American Physical Society, 2022. ista: Li V, Diorico FR, Hosten O. 2022. Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters. Physical Review Applied. 17(5), 054031. mla: Li, Vyacheslav, et al. “Laser Frequency-Offset Locking at 10-Hz-Level Instability Using Hybrid Electronic Filters.” Physical Review Applied, vol. 17, no. 5, 054031, American Physical Society, 2022, doi:10.1103/physrevapplied.17.054031. short: V. Li, F.R. Diorico, O. Hosten, Physical Review Applied 17 (2022). date_created: 2022-06-07T08:07:59Z date_published: 2022-05-19T00:00:00Z date_updated: 2023-08-03T07:18:34Z day: '19' department: - _id: GradSch - _id: OnHo doi: 10.1103/physrevapplied.17.054031 external_id: arxiv: - '2111.13194' isi: - '000880670300001' intvolume: ' 17' isi: 1 issue: '5' keyword: - General Physics and Astronomy language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2111.13194' month: '05' oa: 1 oa_version: Preprint publication: Physical Review Applied publication_identifier: issn: - 2331-7019 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 17 year: '2022' ... --- _id: '9331' abstract: - lang: eng text: 'Quantum entanglement has been generated and verified in cold-atom experiments and used to make atom-interferometric measurements below the shot-noise limit. However, current state-of-the-art cold-atom devices exploit separable (i.e., unentangled) atomic states. This perspective piece asks the question: can entanglement usefully improve cold-atom sensors, in the sense that it gives new sensing capabilities unachievable with current state-of-the-art devices? We briefly review the state-of-the-art in precision cold-atom sensing, focusing on clocks and inertial sensors, identifying the potential benefits entanglement could bring to these devices, and the challenges that need to be overcome to realize these benefits. We survey demonstrated methods of generating metrologically useful entanglement in cold-atom systems, note their relative strengths and weaknesses, and assess their prospects for near-to-medium term quantum-enhanced cold-atom sensing.' acknowledgement: We acknowledge fruitful discussions with John Close, Chris Freier, Kyle Hardman, Joseph Hope, and Paul Wigley, and insightful suggestions made by Franck Pereira dos Santos on behalf of the Atom Interferometry and Inertial Sensors team at SYRTE. S.S.S. was supported by an Australian Research Council Discovery Early Career Researcher Award (DECRA), Project No. DE200100495. O.H. was supported by IST Austria. article_number: '140501' article_processing_charge: No article_type: original author: - first_name: Stuart S. full_name: Szigeti, Stuart S. last_name: Szigeti - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X - first_name: Simon A. full_name: Haine, Simon A. last_name: Haine citation: ama: 'Szigeti SS, Hosten O, Haine SA. Improving cold-atom sensors with quantum entanglement: Prospects and challenges. Applied Physics Letters. 2021;118(14). doi:10.1063/5.0050235' apa: 'Szigeti, S. S., Hosten, O., & Haine, S. A. (2021). Improving cold-atom sensors with quantum entanglement: Prospects and challenges. Applied Physics Letters. AIP Publishing. https://doi.org/10.1063/5.0050235' chicago: 'Szigeti, Stuart S., Onur Hosten, and Simon A. Haine. “Improving Cold-Atom Sensors with Quantum Entanglement: Prospects and Challenges.” Applied Physics Letters. AIP Publishing, 2021. https://doi.org/10.1063/5.0050235.' ieee: 'S. S. Szigeti, O. Hosten, and S. A. Haine, “Improving cold-atom sensors with quantum entanglement: Prospects and challenges,” Applied Physics Letters, vol. 118, no. 14. AIP Publishing, 2021.' ista: 'Szigeti SS, Hosten O, Haine SA. 2021. Improving cold-atom sensors with quantum entanglement: Prospects and challenges. Applied Physics Letters. 118(14), 140501.' mla: 'Szigeti, Stuart S., et al. “Improving Cold-Atom Sensors with Quantum Entanglement: Prospects and Challenges.” Applied Physics Letters, vol. 118, no. 14, 140501, AIP Publishing, 2021, doi:10.1063/5.0050235.' short: S.S. Szigeti, O. Hosten, S.A. Haine, Applied Physics Letters 118 (2021). date_created: 2021-04-18T22:01:40Z date_published: 2021-04-07T00:00:00Z date_updated: 2023-08-07T14:36:42Z day: '07' department: - _id: OnHo doi: 10.1063/5.0050235 external_id: arxiv: - '2010.09168' isi: - '000637702100001' intvolume: ' 118' isi: 1 issue: '14' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2010.09168 month: '04' oa: 1 oa_version: Preprint publication: Applied Physics Letters publication_identifier: issn: - '00036951' publication_status: published publisher: AIP Publishing quality_controlled: '1' scopus_import: '1' status: public title: 'Improving cold-atom sensors with quantum entanglement: Prospects and challenges' type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 118 year: '2021' ... --- _id: '8285' abstract: - lang: eng text: We demonstrate the utility of optical cavity generated spin-squeezed states in free space atomic fountain clocks in ensembles of 390 000 87Rb atoms. Fluorescence imaging, correlated to an initial quantum nondemolition measurement, is used for population spectroscopy after the atoms are released from a confining lattice. For a free fall time of 4 milliseconds, we resolve a single-shot phase sensitivity of 814(61) microradians, which is 5.8(0.6) decibels (dB) below the quantum projection limit. We observe that this squeezing is preserved as the cloud expands to a roughly 200  μm radius and falls roughly 300  μm in free space. Ramsey spectroscopy with 240 000 atoms at a 3.6 ms Ramsey time results in a single-shot fractional frequency stability of 8.4(0.2)×10−12, 3.8(0.2) dB below the quantum projection limit. The sensitivity and stability are limited by the technical noise in the fluorescence detection protocol and the microwave system, respectively. acknowledgement: This work is supported by the Office of Naval Research (N00014-16-1-2927- A00003), Vannevar Bush Faculty Fellowship (N00014-16-1-2812- P00005), Department of Energy (DE-SC0019174- 0001), and Defense Threat Reduction Agency (HDTRA1-15-1-0017- P00005). article_number: '043202' article_processing_charge: No article_type: original author: - first_name: Benjamin K. full_name: Malia, Benjamin K. last_name: Malia - first_name: Julián full_name: Martínez-Rincón, Julián last_name: Martínez-Rincón - first_name: Yunfan full_name: Wu, Yunfan last_name: Wu - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X - first_name: Mark A. full_name: Kasevich, Mark A. last_name: Kasevich citation: ama: Malia BK, Martínez-Rincón J, Wu Y, Hosten O, Kasevich MA. Free space Ramsey spectroscopy in rubidium with noise below the quantum projection limit. Physical Review Letters. 2020;125(4). doi:10.1103/PhysRevLett.125.043202 apa: Malia, B. K., Martínez-Rincón, J., Wu, Y., Hosten, O., & Kasevich, M. A. (2020). Free space Ramsey spectroscopy in rubidium with noise below the quantum projection limit. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.125.043202 chicago: Malia, Benjamin K., Julián Martínez-Rincón, Yunfan Wu, Onur Hosten, and Mark A. Kasevich. “Free Space Ramsey Spectroscopy in Rubidium with Noise below the Quantum Projection Limit.” Physical Review Letters. American Physical Society, 2020. https://doi.org/10.1103/PhysRevLett.125.043202. ieee: B. K. Malia, J. Martínez-Rincón, Y. Wu, O. Hosten, and M. A. Kasevich, “Free space Ramsey spectroscopy in rubidium with noise below the quantum projection limit,” Physical Review Letters, vol. 125, no. 4. American Physical Society, 2020. ista: Malia BK, Martínez-Rincón J, Wu Y, Hosten O, Kasevich MA. 2020. Free space Ramsey spectroscopy in rubidium with noise below the quantum projection limit. Physical Review Letters. 125(4), 043202. mla: Malia, Benjamin K., et al. “Free Space Ramsey Spectroscopy in Rubidium with Noise below the Quantum Projection Limit.” Physical Review Letters, vol. 125, no. 4, 043202, American Physical Society, 2020, doi:10.1103/PhysRevLett.125.043202. short: B.K. Malia, J. Martínez-Rincón, Y. Wu, O. Hosten, M.A. Kasevich, Physical Review Letters 125 (2020). date_created: 2020-08-24T06:24:04Z date_published: 2020-07-24T00:00:00Z date_updated: 2023-10-18T08:38:35Z day: '24' department: - _id: OnHo doi: 10.1103/PhysRevLett.125.043202 external_id: arxiv: - '1912.10218' isi: - '000552227400008' pmid: - '32794788' intvolume: ' 125' isi: 1 issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1912.10218 month: '07' oa: 1 oa_version: Preprint pmid: 1 publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 issn: - 0031-9007 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Free space Ramsey spectroscopy in rubidium with noise below the quantum projection limit type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 125 year: '2020' ... --- _id: '8319' abstract: - lang: eng text: We demonstrate that releasing atoms into free space from an optical lattice does not deteriorate cavity-generated spin squeezing for metrological purposes. In this work, an ensemble of 500000 spin-squeezed atoms in a high-finesse optical cavity with near-uniform atom-cavity coupling is prepared, released into free space, recaptured in the cavity, and probed. Up to ∼10 dB of metrologically relevant squeezing is retrieved for 700μs free-fall times, and decaying levels of squeezing are realized for up to 3 ms free-fall times. The degradation of squeezing results from loss of atom-cavity coupling homogeneity between the initial squeezed state generation and final collective state readout. A theoretical model is developed to quantify this degradation and this model is experimentally validated. acknowledgement: We thank N. Engelsen for comments on the manuscript. This work was supported by the Office of Naval Research, Vannevar Bush Faculty Fellowship, Department of Energy, and Defense Threat Reduction Agency. R.K. was partly supported by the AQT/INQNET program at Caltech. article_number: '012224' article_processing_charge: No article_type: original author: - first_name: Yunfan full_name: Wu, Yunfan last_name: Wu - first_name: Rajiv full_name: Krishnakumar, Rajiv last_name: Krishnakumar - first_name: Julián full_name: Martínez-Rincón, Julián last_name: Martínez-Rincón - first_name: Benjamin K. full_name: Malia, Benjamin K. last_name: Malia - first_name: Onur full_name: Hosten, Onur id: 4C02D85E-F248-11E8-B48F-1D18A9856A87 last_name: Hosten orcid: 0000-0002-2031-204X - first_name: Mark A. full_name: Kasevich, Mark A. last_name: Kasevich citation: ama: Wu Y, Krishnakumar R, Martínez-Rincón J, Malia BK, Hosten O, Kasevich MA. Retrieval of cavity-generated atomic spin squeezing after free-space release. Physical Review A. 2020;102(1). doi:10.1103/PhysRevA.102.012224 apa: Wu, Y., Krishnakumar, R., Martínez-Rincón, J., Malia, B. K., Hosten, O., & Kasevich, M. A. (2020). Retrieval of cavity-generated atomic spin squeezing after free-space release. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.102.012224 chicago: Wu, Yunfan, Rajiv Krishnakumar, Julián Martínez-Rincón, Benjamin K. Malia, Onur Hosten, and Mark A. Kasevich. “Retrieval of Cavity-Generated Atomic Spin Squeezing after Free-Space Release.” Physical Review A. American Physical Society, 2020. https://doi.org/10.1103/PhysRevA.102.012224. ieee: Y. Wu, R. Krishnakumar, J. Martínez-Rincón, B. K. Malia, O. Hosten, and M. A. Kasevich, “Retrieval of cavity-generated atomic spin squeezing after free-space release,” Physical Review A, vol. 102, no. 1. American Physical Society, 2020. ista: Wu Y, Krishnakumar R, Martínez-Rincón J, Malia BK, Hosten O, Kasevich MA. 2020. Retrieval of cavity-generated atomic spin squeezing after free-space release. Physical Review A. 102(1), 012224. mla: Wu, Yunfan, et al. “Retrieval of Cavity-Generated Atomic Spin Squeezing after Free-Space Release.” Physical Review A, vol. 102, no. 1, 012224, American Physical Society, 2020, doi:10.1103/PhysRevA.102.012224. short: Y. Wu, R. Krishnakumar, J. Martínez-Rincón, B.K. Malia, O. Hosten, M.A. Kasevich, Physical Review A 102 (2020). date_created: 2020-08-30T22:01:10Z date_published: 2020-07-30T00:00:00Z date_updated: 2024-02-28T13:11:28Z day: '30' department: - _id: OnHo doi: 10.1103/PhysRevA.102.012224 external_id: arxiv: - '1912.08334' isi: - '000555104200011' intvolume: ' 102' isi: 1 issue: '1' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1912.08334 month: '07' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - '24699934' issn: - '24699926' publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Retrieval of cavity-generated atomic spin squeezing after free-space release type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 102 year: '2020' ...