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Quantum Measurements and Quantum Metrology最新文献

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Plenoptic imaging with second-order correlations of light 光的二阶相关的全光学成像
Quantum Measurements and Quantum Metrology Pub Date : 2017-04-14 DOI: 10.1515/qmetro-2016-0004
F. Pepe, G. Scarcelli, A. Garuccio, M. D’Angelo
{"title":"Plenoptic imaging with second-order correlations of light","authors":"F. Pepe, G. Scarcelli, A. Garuccio, M. D’Angelo","doi":"10.1515/qmetro-2016-0004","DOIUrl":"https://doi.org/10.1515/qmetro-2016-0004","url":null,"abstract":"Abstract Plenoptic imaging is a promising optical modality that simultaneously captures the location and the propagation direction of light in order to enable tridimensional imaging in a single shot. We demonstrate that it is possible to implement plenoptic imaging through second-order correlations of chaotic light, thus enabling to overcome the typical limitations of classical plenoptic devices.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128556711","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}
引用次数: 18
Heralded orthogonalisation of coherent states and their conversion to discrete-variable superpositions 相干态的预示正交化及其向离散变量叠加态的转换
Quantum Measurements and Quantum Metrology Pub Date : 2017-02-01 DOI: 10.1515/qmetro-2017-0005
R. Kruse, C. Silberhorn, T. Bartley
{"title":"Heralded orthogonalisation of coherent states and their conversion to discrete-variable superpositions","authors":"R. Kruse, C. Silberhorn, T. Bartley","doi":"10.1515/qmetro-2017-0005","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0005","url":null,"abstract":"Abstract The nonorthogonality of coherent states is a fundamental property which prevents them from being perfectly and deterministically discriminated. Here, we present an experimentally feasible protocol for the probabilistic orthogonalisation of a pair of coherent states, independent of their amplitude and phase. In contrast to unambiguous state discrimination, a successful operation of our protocol is heralded without measuring the states. As such, they remain suitable for further manipulation and the obtained orthogonal states serve as a discretevariable basis. Therefore, our protocol doubles as a simple continuous-to-discrete variable converter, which may find application in hybrid continuous-discrete quantum information processing protocols.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127100459","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}
引用次数: 1
Approximate Quantum Adders with Genetic Algorithms: An IBM Quantum Experience 近似量子加法器与遗传算法:IBM量子经验
Quantum Measurements and Quantum Metrology Pub Date : 2016-11-23 DOI: 10.1515/qmetro-2017-0001
Rui Li, U. Alvarez-Rodriguez, L. Lamata, E. Solano
{"title":"Approximate Quantum Adders with Genetic Algorithms: An IBM Quantum Experience","authors":"Rui Li, U. Alvarez-Rodriguez, L. Lamata, E. Solano","doi":"10.1515/qmetro-2017-0001","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0001","url":null,"abstract":"Abstract It has been proven that quantum adders are forbidden by the laws of quantum mechanics. We analyze theoretical proposals for the implementation of approximate quantum adders and optimize them by means of genetic algorithms, improving previous protocols in terms of efficiency and fidelity. Furthermore, we experimentally realize a suitable approximate quantum adder with the cloud quantum computing facilities provided by IBM Quantum Experience. The development of approximate quantum adders enhances the toolbox of quantum information protocols, paving the way for novel applications in quantum technologies.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122873210","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}
引用次数: 59
Hamiltonian extensions in quantum metrology 量子计量学中的哈密顿扩展
Quantum Measurements and Quantum Metrology Pub Date : 2016-10-19 DOI: 10.1515/qmetro-2017-0002
J. M. E. Fraïsse, D. Braun
{"title":"Hamiltonian extensions in quantum metrology","authors":"J. M. E. Fraïsse, D. Braun","doi":"10.1515/qmetro-2017-0002","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0002","url":null,"abstract":"Abstract We study very generally towhat extent the uncertainty with which a phase shift can be estimated in quantum metrology can be reduced by extending the Hamiltonian that generates the phase shift to an ancilla system with a Hilbert space of arbitrary dimension, and allowing arbitrary interactions between the original system and the ancilla. Such Hamiltonian extensions provide a general framework for open quantum systems, as well as for “non-linear metrology schemes” that have been investigated over the last few years. We prove that such Hamiltonian extensions cannot improve the sensitivity of the phase shift measurement when considering the quantum Fisher information optimized over input states.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128004992","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}
引用次数: 5
Precision Limits in Quantum Metrology with Open Quantum Systems 开放量子系统下量子计量的精度极限
Quantum Measurements and Quantum Metrology Pub Date : 2016-08-01 DOI: 10.1515/qmetro-2018-0002
J. Haase, A. Smirne, Jan Kolody'nski, Rafal Demkowicz-Dobrza'nski, S. Huelga
{"title":"Precision Limits in Quantum Metrology with Open Quantum Systems","authors":"J. Haase, A. Smirne, Jan Kolody'nski, Rafal Demkowicz-Dobrza'nski, S. Huelga","doi":"10.1515/qmetro-2018-0002","DOIUrl":"https://doi.org/10.1515/qmetro-2018-0002","url":null,"abstract":"Abstract The laws of quantum mechanics allow to perform measurements whose precision supersedes results predicted by classical parameter estimation theory. That is, the precision bound imposed by the central limit theorem in the estimation of a broad class of parameters, like atomic frequencies in spectroscopy or external magnetic field in magnetometry, can be overcomewhen using quantum probes. Environmental noise, however, generally alters the ultimate precision that can be achieved in the estimation of an unknown parameter. This tutorial reviews recent theoretical work aimed at obtaining general precision bounds in the presence of an environment.We adopt a complementary approach,wherewe first analyze the problem within the general framework of describing the quantum systems in terms of quantum dynamical maps and then relate this abstract formalism to a microscopic description of the system’s dissipative time evolution.We will show that although some forms of noise do render quantum systems standard quantum limited, precision beyond classical bounds is still possible in the presence of different forms of local environmental fluctuations.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132870143","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}
引用次数: 44
Towards joint reconstruction of noise and losses in quantum channels 量子信道中噪声和损耗的联合重建
Quantum Measurements and Quantum Metrology Pub Date : 2016-02-29 DOI: 10.1515/qmetro-2016-0005
F. Piacentini, A. Avella, P. Traina, L. Lolli, E. Taralli, Eugenio Monticone, M. Rajteri, D. Fukuda, I. Degiovanni, G. Brida
{"title":"Towards joint reconstruction of noise and losses in quantum channels","authors":"F. Piacentini, A. Avella, P. Traina, L. Lolli, E. Taralli, Eugenio Monticone, M. Rajteri, D. Fukuda, I. Degiovanni, G. Brida","doi":"10.1515/qmetro-2016-0005","DOIUrl":"https://doi.org/10.1515/qmetro-2016-0005","url":null,"abstract":"Abstract The calibration of a quantum channel, i.e. the determination of the transmission losses affecting it, is definitely one of the principal objectives in both the quantum communication and quantum metrology frameworks. Another task of the utmost relevance is the identification, e.g. by extracting its photon number distribution, of the noise potentially present in the channel. Here we present a protocol, based on the response of a photon-number-resolving detector at different quantum efficiencies, able to accomplish both of these tasks at once, providing with a single measurement an estimate of the transmission losses as well as the photon statistics of the noise present in the exploited quantum channel. We show and discuss the experimental results obtained in the practical implementation of such protocol, with different kinds and levels of noise.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122292956","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}
引用次数: 1
Fisher Concord: Efficiency of Quantum Measurement Fisher Concord:量子测量的效率
Quantum Measurements and Quantum Metrology Pub Date : 2016-01-30 DOI: 10.1515/qmetro-2016-0008
Nan Li, S. Luo
{"title":"Fisher Concord: Efficiency of Quantum Measurement","authors":"Nan Li, S. Luo","doi":"10.1515/qmetro-2016-0008","DOIUrl":"https://doi.org/10.1515/qmetro-2016-0008","url":null,"abstract":"Abstract By comparing measurement-induced classical Fisher information of parameterized quantum states with quantum Fisher information,we study the notion of Fisher concord (as abbreviation of the concord between the classical and the quantum Fisher information), which is an information-theoretic measure of quantum states and quantum measurements based on both classical and quantum Fisher information. Fisher concord is defined by multiplying the inverse square root of quantum Fisher information matrix to measurement-induced classical Fisher information matrix on both sides, and quantifies the relative accessibility of parameter information from quantum measurements (alternatively, the efficiency of quantum measurements in extracting parameter information). It reduces to the ratio of the classical Fisher information to quantum Fisher information in any single parameter scenario. In general, Fisher concord is a symmetric matrix which depends on both quantum states and quantum measurements. Some basic properties of Fisher concord are elucidated. The significance of Fisher concord in quantifying the interplay between classicality and quantumness in parameter estimation and in characterizing the ef- ficiency of quantum measurements are illustrated through several examples, and some information conservation relations in terms of Fisher concord are exhibited.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"6 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124799474","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}
引用次数: 2
Quantum channel-estimation with particle loss: GHZ versus W states 具有粒子损耗的量子信道估计:GHZ与W态
Quantum Measurements and Quantum Metrology Pub Date : 2016-01-30 DOI: 10.1515/qmetro-2016-0009
J. M. E. Fraïsse, D. Braun
{"title":"Quantum channel-estimation with particle loss: GHZ versus W states","authors":"J. M. E. Fraïsse, D. Braun","doi":"10.1515/qmetro-2016-0009","DOIUrl":"https://doi.org/10.1515/qmetro-2016-0009","url":null,"abstract":"Abstract We consider quantum channel-estimation for depolarizing channels and phase-flip channels extended by ancilla qubits and fed with a GHZ orWstate. After application of the channel one or several qubits can be lost, and we calculate the impact of the loss on the quantum Fisher information that determines the smallest uncertainty with which the parameters of these channels can be estimated.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134110147","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}
引用次数: 6
Superdense Coding Interleaved with Forward Error Correction 前向纠错交错的超密集编码
Quantum Measurements and Quantum Metrology Pub Date : 2016-01-23 DOI: 10.1515/qmetro-2016-0001
Ronald J. Sadlier, T. Humble
{"title":"Superdense Coding Interleaved with Forward Error Correction","authors":"Ronald J. Sadlier, T. Humble","doi":"10.1515/qmetro-2016-0001","DOIUrl":"https://doi.org/10.1515/qmetro-2016-0001","url":null,"abstract":"Abstract Superdense coding promises increased classical capacity and communication security but this advantage may be undermined by noise in the quantum channel. We present a numerical study of how forward error correction (FEC) applied to the encoded classical message can be used to mitigate against quantum channel noise. By studying the bit error rate under different FEC codes, we identify the unique role that burst errors play in superdense coding, and we show how these can be mitigated against by interleaving the FEC codewords prior to transmission. We conclude that classical FEC with interleaving is a useful method to improve the performance in near-term demonstrations of superdense coding.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123323664","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}
引用次数: 11
Teleportation in an indivisible quantum system 不可分量子系统中的隐形传态
Quantum Measurements and Quantum Metrology Pub Date : 2015-12-16 DOI: 10.1515/qmetro-2016-0003
E. Kiktenko, A. Fedorov, Vladimir I. Man’ko
{"title":"Teleportation in an indivisible quantum system","authors":"E. Kiktenko, A. Fedorov, Vladimir I. Man’ko","doi":"10.1515/qmetro-2016-0003","DOIUrl":"https://doi.org/10.1515/qmetro-2016-0003","url":null,"abstract":"Abstract Teleportation protocol is conventionally treated as a method for quantum state transfer between two spatially separated physical carriers. Recent experimental progress in manipulation with high-dimensional quantum systems opens a new framework for implementation of teleportation protocols. We show that the one-qubit teleportation can be considered as a state transfer between subspaces of the whole Hilbert space of an indivisible eight-dimensional system. We explicitly show all corresponding operations and discuss an alternative way of implementation of similar tasks.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129936375","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}
引用次数: 6
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