We present sensitivity limits for a multimode interferometer as matrix bounds for the covariance matrix. Quantum strategies to improve the precision beyond classical limits may consist in entanglement among the modes or among the particles.
{"title":"Sensitivity Limits for Multiparameter Quantum Metrology","authors":"M. Gessner, L. Pezzè, A. Smerzi","doi":"10.1364/qim.2019.s3b.4","DOIUrl":"https://doi.org/10.1364/qim.2019.s3b.4","url":null,"abstract":"We present sensitivity limits for a multimode interferometer as matrix bounds for the covariance matrix. Quantum strategies to improve the precision beyond classical limits may consist in entanglement among the modes or among the particles.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"48 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":"114622130","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. Saggio, Aleksandra Dimić, C. Greganti, L. Rozema, P. Walther, B. Dakić
Entanglement verification becomes hard when dealing with large quantum systems. By treating this task probabilistically, we certify entanglement with high confidence in an experimental photonic six-qubit cluster state by using only a few detection events.
{"title":"Verifying Multi-Particle Entanglement with a Few Detection Events","authors":"V. Saggio, Aleksandra Dimić, C. Greganti, L. Rozema, P. Walther, B. Dakić","doi":"10.1364/QIM.2019.F5A.7","DOIUrl":"https://doi.org/10.1364/QIM.2019.F5A.7","url":null,"abstract":"Entanglement verification becomes hard when dealing with large quantum systems. By treating this task probabilistically, we certify entanglement with high confidence in an experimental photonic six-qubit cluster state by using only a few detection events.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"39 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":"125885192","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}
C. Autebert, M. Perrenoud, M. Caloz, Gaetan Gras, E. Amri, H. Zbinden, F. Bussières
In this paper we demonstrate a simple and highly sensitive method to characterize the recovery time of efficiency for different kind of superconducting nanowire single- photon detectors. We also describe several applications of these detectors.
{"title":"Direct measurement of the recovery time of SNSPDs and its application for quantum communication","authors":"C. Autebert, M. Perrenoud, M. Caloz, Gaetan Gras, E. Amri, H. Zbinden, F. Bussières","doi":"10.1364/QIM.2019.S1D.3","DOIUrl":"https://doi.org/10.1364/QIM.2019.S1D.3","url":null,"abstract":"In this paper we demonstrate a simple and highly sensitive method to characterize the recovery time of efficiency for different kind of superconducting nanowire single- photon detectors. We also describe several applications of these detectors.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"75 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":"128588445","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}
C. Ballance, L. J. Stephenson, D. Nadlinger, B. Nichol, S. An, J. Goodwin, P. Drmota, D. Lucas
We discuss a scalable approach to networking trapped-ion quantum processors. We present initial networking results, showing that we can connect registers of near-perfect trapped-ion data qubits via a flexible photonic link.
{"title":"Networking Trapped-ion Quantum Computers","authors":"C. Ballance, L. J. Stephenson, D. Nadlinger, B. Nichol, S. An, J. Goodwin, P. Drmota, D. Lucas","doi":"10.1364/QIM.2019.S2D.1","DOIUrl":"https://doi.org/10.1364/QIM.2019.S2D.1","url":null,"abstract":"We discuss a scalable approach to networking trapped-ion quantum processors. We present initial networking results, showing that we can connect registers of near-perfect trapped-ion data qubits via a flexible photonic link.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"15 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":"127486613","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}
F. Bouchard, Alicia Sit, F. Hufnagel, R. Fickler, K. Heshami, R. Boyd, E. Karimi
We investigate various high-dimensional quantum cryptographic protocols using twisted photons and their feasibility in realistic conditions. In particular, we perform quantum key distribution in an intra-city freespace link and an underwater channel.
{"title":"High-Dimensional Quantum Cryptography using Twisted Photons; from the Laboratory to realistic conditions","authors":"F. Bouchard, Alicia Sit, F. Hufnagel, R. Fickler, K. Heshami, R. Boyd, E. Karimi","doi":"10.1364/QIM.2019.S2A.3","DOIUrl":"https://doi.org/10.1364/QIM.2019.S2A.3","url":null,"abstract":"We investigate various high-dimensional quantum cryptographic protocols using twisted photons and their feasibility in realistic conditions. In particular, we perform quantum key distribution in an intra-city freespace link and an underwater channel.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"14 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":"131963493","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. Procopio, F. Delgado, M. Enríquez, N. Belabas, J. Levenson
It has recently been shown that if two completely depolarizing channels are in a superposition of different orders, classical information can be transmitted that would be otherwise lost [1]. Here, we present a generalization of the results of [1] to study communication with arbitrary depolarizing channels and putting to good use indefinite causal order, a new paradigm for quantum information/computation.
{"title":"Communication using an indefinite causal structure","authors":"L. Procopio, F. Delgado, M. Enríquez, N. Belabas, J. Levenson","doi":"10.1364/QIM.2019.F5A.27","DOIUrl":"https://doi.org/10.1364/QIM.2019.F5A.27","url":null,"abstract":"It has recently been shown that if two completely depolarizing channels are in a superposition of different orders, classical information can be transmitted that would be otherwise lost [1]. Here, we present a generalization of the results of [1] to study communication with arbitrary depolarizing channels and putting to good use indefinite causal order, a new paradigm for quantum information/computation.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"48 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":"132143667","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}
É. Gouzien, B. Fedrici, A. Zavatta, S. Tanzilli, V. D’Auria
We model single photon detectors by explicitly taking into account their timing- jitter, finite efficiency and dead-time effects. Our model represents the first operational and full description of temporal limitations of those detectors.
{"title":"Quantum Description of Single Photon Detectors Including Timing-Jitter Effects","authors":"É. Gouzien, B. Fedrici, A. Zavatta, S. Tanzilli, V. D’Auria","doi":"10.1364/QIM.2019.T5A.38","DOIUrl":"https://doi.org/10.1364/QIM.2019.T5A.38","url":null,"abstract":"We model single photon detectors by explicitly taking into account their timing- jitter, finite efficiency and dead-time effects. Our model represents the first operational and full description of temporal limitations of those detectors.","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":"129194151","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}
We propose a scheme based on sum frequency generation seeded by multimode squeezed vacuum light. It provides manipulation of seeding mode weights, tailoring output spectral and temporal signal, generation of squeezed vacuum in sum frequency.
{"title":"Quantum-optical Converter for Squeezed Light","authors":"V. Sukharnikov, O. Tikhonova","doi":"10.1364/QIM.2019.T5A.13","DOIUrl":"https://doi.org/10.1364/QIM.2019.T5A.13","url":null,"abstract":"We propose a scheme based on sum frequency generation seeded by multimode squeezed vacuum light. It provides manipulation of seeding mode weights, tailoring output spectral and temporal signal, generation of squeezed vacuum in sum frequency.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"11 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":"128804433","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}
Xueshi Guo, J. Borregaard, Casper R. Breum, S. Izumi, M. V. Larsen, Jonas S Neergaard-Nielsen, U. Andersen
We investigate the sensitivity of distributed phase sensing with squeezed state probes. By creating mode entanglement between probes with a beam-splitter network, sensitivity enhancement over independent probes is observed experimentally for the first time.
{"title":"Sensitivity enhancement by mode entanglement in distributed phase sensing","authors":"Xueshi Guo, J. Borregaard, Casper R. Breum, S. Izumi, M. V. Larsen, Jonas S Neergaard-Nielsen, U. Andersen","doi":"10.1364/QIM.2019.S4A.4","DOIUrl":"https://doi.org/10.1364/QIM.2019.S4A.4","url":null,"abstract":"We investigate the sensitivity of distributed phase sensing with squeezed state probes. By creating mode entanglement between probes with a beam-splitter network, sensitivity enhancement over independent probes is observed experimentally for the first time.","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":"126763437","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}
D. Gangloff, G. 'Ethier-Majcher, C. Lang, E. Denning, J. Bodey, D. Jackson, C. L. Gall, M. Atatüre
We implement an all-optical access to the quantized electronic-nuclear spin transitions in a semiconductor quantum dot, and we perform coherent rotations of a collective nuclear spin excitation corresponding to a spin-wave called a nuclear magnon.
{"title":"Coherent excitation of a spin wave in an optically cooled nuclear ensemble","authors":"D. Gangloff, G. 'Ethier-Majcher, C. Lang, E. Denning, J. Bodey, D. Jackson, C. L. Gall, M. Atatüre","doi":"10.1364/QIM.2019.F4C.5","DOIUrl":"https://doi.org/10.1364/QIM.2019.F4C.5","url":null,"abstract":"We implement an all-optical access to the quantized electronic-nuclear spin transitions in a semiconductor quantum dot, and we perform coherent rotations of a collective nuclear spin excitation corresponding to a spin-wave called a nuclear magnon.","PeriodicalId":370877,"journal":{"name":"Quantum Information and Measurement (QIM) V: Quantum Technologies","volume":"85 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":"126232129","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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