J. Sperling, E. Meyer-Scott, J. Tiedau, M. Bohmann, S. Barkhofen, B. Brecht, T. Bartley, W. Vogel, I. Walmsley, C. Silberhorn
Quasiprobabilities provide an intuitive means for characterizing quantum states. Here we present a unified framework that combines recent theoretical advances, and we discuss experimental implementations, such as the first reconstruction of entanglement quasiprobabilities.
{"title":"Quasiprobability Representation for Quantum Correlations and Measurements","authors":"J. Sperling, E. Meyer-Scott, J. Tiedau, M. Bohmann, S. Barkhofen, B. Brecht, T. Bartley, W. Vogel, I. Walmsley, C. Silberhorn","doi":"10.1364/QIM.2019.S2B.6","DOIUrl":"https://doi.org/10.1364/QIM.2019.S2B.6","url":null,"abstract":"Quasiprobabilities provide an intuitive means for characterizing quantum states. Here we present a unified framework that combines recent theoretical advances, and we discuss experimental implementations, such as the first reconstruction of entanglement quasiprobabilities.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"282 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122949838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Precise rotation measurements have broad applications. Some quantum states dramatically enhance sensitivities in estimating rotation angles around known axes. We present states that increase sensitivities in estimating both the orientation of an unknown rotation axis and the angle rotated about it.
{"title":"Quantum-enhanced rotation measurements about unknown axes","authors":"A. Z. Goldberg, D. James","doi":"10.1364/QIM.2019.T5A.30","DOIUrl":"https://doi.org/10.1364/QIM.2019.T5A.30","url":null,"abstract":"Precise rotation measurements have broad applications. Some quantum states dramatically enhance sensitivities in estimating rotation angles around known axes. We present states that increase sensitivities in estimating both the orientation of an unknown rotation axis and the angle rotated about it.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126617748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Larrouy, E. Dietsche, R. Richaud, J. Raimond, M. Brune, S. Gleyzes
We prepare non-classical states of Rydberg atoms and use them as probes to measure electric and magnetic fields with a sensitivity below the standard quantum limit.
我们制备了里德伯原子的非经典态，并用它们作为探针，以低于标准量子极限的灵敏度测量电场和磁场。
{"title":"Quantum sensing using Rydberg atoms","authors":"A. Larrouy, E. Dietsche, R. Richaud, J. Raimond, M. Brune, S. Gleyzes","doi":"10.1364/QIM.2019.S3A.5","DOIUrl":"https://doi.org/10.1364/QIM.2019.S3A.5","url":null,"abstract":"We prepare non-classical states of Rydberg atoms and use them as probes to measure electric and magnetic fields with a sensitivity below the standard quantum limit.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124943638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiao Xiang, R. Dong, Shaofeng Wang, N. Treps, C. Fabre, Tao Liu, Shougang Zhang
The first quantum-enhanced interferometric timing measurement with a squeezed optical frequency comb was demonstrated. The timing resolution at 2 MHz was improved from a shot-noise limited value of (2.8 ± 0.1) × 10−20 s to (2.4 ± 0.1) × 10−20 s.
{"title":"Quantum-enhanced interferometric timing measurement with a squeezed optical frequency comb","authors":"Xiao Xiang, R. Dong, Shaofeng Wang, N. Treps, C. Fabre, Tao Liu, Shougang Zhang","doi":"10.1364/QIM.2019.S3D.5","DOIUrl":"https://doi.org/10.1364/QIM.2019.S3D.5","url":null,"abstract":"The first quantum-enhanced interferometric timing measurement with a squeezed optical frequency comb was demonstrated. The timing resolution at 2 MHz was improved from a shot-noise limited value of (2.8 ± 0.1) × 10−20 s to (2.4 ± 0.1) × 10−20 s.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124990362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Hanley, J. Wolf, C. Löschnauer, Marius Weber, J. Goodwin, T. Harty, A. Steane, D. Lucas
We present the design and initial characterisation of a next-generation surface-electrode ion-trap designed for room-temperature or cryogenic operation, that will aim to improve both the fidelity and speed achieved in microwave-driven quantum gates.
{"title":"Microwave-driven high-fidelity quantum logic with 43Ca+","authors":"R. Hanley, J. Wolf, C. Löschnauer, Marius Weber, J. Goodwin, T. Harty, A. Steane, D. Lucas","doi":"10.1364/QIM.2019.S4B.4","DOIUrl":"https://doi.org/10.1364/QIM.2019.S4B.4","url":null,"abstract":"We present the design and initial characterisation of a next-generation surface-electrode ion-trap designed for room-temperature or cryogenic operation, that will aim to improve both the fidelity and speed achieved in microwave-driven quantum gates.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115513867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Lucivero, W. Lee, M. Limes, E. Foley, T. Kornack, M. Romalis
We describe an optically pumped atomic gradiometer operating at finite fields, including Earth’s field, with 14 fT / Hz Hz sensitivity. We demonstrate its quantum-noise-limited behaviour in the presence of quantum spin noise and atomic diffusion.
我们描述了一种在有限场(包括地球场)下工作的光泵原子梯度仪，其灵敏度为14 fT / Hz。我们证明了它在量子自旋噪声和原子扩散存在下的量子噪声限制行为。
{"title":"A femtotesla quantum-noise-limited pulsed gradiometer at finite fields","authors":"V. Lucivero, W. Lee, M. Limes, E. Foley, T. Kornack, M. Romalis","doi":"10.1364/QIM.2019.T3C.3","DOIUrl":"https://doi.org/10.1364/QIM.2019.T3C.3","url":null,"abstract":"We describe an optically pumped atomic gradiometer operating at finite fields, including Earth’s field, with 14 fT / Hz Hz sensitivity. We demonstrate its quantum-noise-limited behaviour in the presence of quantum spin noise and atomic diffusion.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116976665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Characterizing large-scale quantum devices is challenging because quantum noise processes are complex. We present a method for efficiently characterizing general operations in quantum devices with signal-to-noise ratios independent of the system size.
{"title":"Characterizing large-scale quantum devices","authors":"Joel J. Wallman, J. Emerson","doi":"10.1364/QIM.2019.S3B.2","DOIUrl":"https://doi.org/10.1364/QIM.2019.S3B.2","url":null,"abstract":"Characterizing large-scale quantum devices is challenging because quantum noise processes are complex. We present a method for efficiently characterizing general operations in quantum devices with signal-to-noise ratios independent of the system size.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123918267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Qiu, I. Shomroni, D. Malz, A. Nunnenkamp, T. Kippenberg
Quantum mechanics sets a limit on continuous position measurement of a harmonic oscillator, due to quantum backaction from quantum fluctuations in the measurement field. We demonstrate continuous optical two-tone backaction-evading measurement of a mechanical mode of a photonic crystal nanobeam.
{"title":"Optical Back-action Evading Measurement of Mechanical Oscillator","authors":"L. Qiu, I. Shomroni, D. Malz, A. Nunnenkamp, T. Kippenberg","doi":"10.1364/QIM.2019.S1C.2","DOIUrl":"https://doi.org/10.1364/QIM.2019.S1C.2","url":null,"abstract":"Quantum mechanics sets a limit on continuous position measurement of a harmonic oscillator, due to quantum backaction from quantum fluctuations in the measurement field. We demonstrate continuous optical two-tone backaction-evading measurement of a mechanical mode of a photonic crystal nanobeam.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126106359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Manuel Erhard, M. Krenn, Xumei Gu, M. Malik, A. Zeilinger
Starting with the first experimental generation of a Greenberger-Horne-Zeilinger entangled state in three dimensions we show how to describe photonic quantum experiments using graph theory. This novel link promises exciting new applications ranging from multi-photon high-dimensionally entangled states to special purpose quantum simulation.
{"title":"Quantum Information Experiments with Multiple Photons in One and High-Dimensions: Concepts and Experiments","authors":"Manuel Erhard, M. Krenn, Xumei Gu, M. Malik, A. Zeilinger","doi":"10.1364/QIM.2019.T3A.3","DOIUrl":"https://doi.org/10.1364/QIM.2019.T3A.3","url":null,"abstract":"Starting with the first experimental generation of a Greenberger-Horne-Zeilinger entangled state in three dimensions we show how to describe photonic quantum experiments using graph theory. This novel link promises exciting new applications ranging from multi-photon high-dimensionally entangled states to special purpose quantum simulation.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126074630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The dynamics of tripartite systems of field-atom interactions and optome-chanics is investigated through relevant tomograms. Quadrature and tomographic entropic squeezing and entanglement properties are examined . Entanglement collapses to constant nonzero values over significant time intervals.
{"title":"Dynamics of tripartite quantum systems: Squeezing properties and entanglement collapse to nonzero constant values","authors":"Pradip Laha, S. Lakshmibala, V. Balakrishnan","doi":"10.1364/QIM.2019.F5A.54","DOIUrl":"https://doi.org/10.1364/QIM.2019.F5A.54","url":null,"abstract":"The dynamics of tripartite systems of field-atom interactions and optome-chanics is investigated through relevant tomograms. Quadrature and tomographic entropic squeezing and entanglement properties are examined . Entanglement collapses to constant nonzero values over significant time intervals.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128742504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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