发布求助
文献互助 智能选刊 最新文献

Quantum Measurements and Quantum Metrology最新文献

筛选
英文 中文
Autocorrelation functions: a useful tool for both state and detector characterisation 自相关函数:状态和检测器表征的有用工具
Quantum Measurements and Quantum Metrology Pub Date : 2018-12-07 DOI: 10.1515/qmetro-2019-0001
Giovanni Chesi, A. Allevi, M. Bondani
{"title":"Autocorrelation functions: a useful tool for both state and detector characterisation","authors":"Giovanni Chesi, A. Allevi, M. Bondani","doi":"10.1515/qmetro-2019-0001","DOIUrl":"https://doi.org/10.1515/qmetro-2019-0001","url":null,"abstract":"Abstract The calculation of autocorrelation functions represents a routinely used tool to characterise quantum states of light. In this paper, we evaluate the g(2) function for detected photons in the case of mesoscopic multi-mode twin-beam states in order to fully investigate their statistical properties starting from measurable quantities. Moreover, we show that the second-order autocorrelation function is also useful to estimate the spurious effects affecting the employed Silicon-photomultiplier detectors.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127108731","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: 4
Non-Markovianity is not a resource for quantum spatial search on a star graph subject to generalized percolation 非马尔可夫性不是在广义渗流星图上进行量子空间搜索的资源
Quantum Measurements and Quantum Metrology Pub Date : 2018-11-12 DOI: 10.1515/qmetro-2018-0003
M. Rossi, M. Cattaneo, M. Paris, S. Maniscalco
{"title":"Non-Markovianity is not a resource for quantum spatial search on a star graph subject to generalized percolation","authors":"M. Rossi, M. Cattaneo, M. Paris, S. Maniscalco","doi":"10.1515/qmetro-2018-0003","DOIUrl":"https://doi.org/10.1515/qmetro-2018-0003","url":null,"abstract":"Abstract Continuous-time quantum walks may be exploited to enhance spatial search, i.e., for finding a marked element in a database structured as a complex network. However, in practical implementations, the environmental noise has detrimental effects, and a question arises on whether noise engineering may be helpful in mitigating those effects on the performance of the quantum algorithm. Here we study whether time-correlated noise inducing non-Markovianity may represent a resource for quantum search. In particular, we consider quantum search on a star graph, which has been proven to be optimal in the noiseless case, and analyze the effects of independent random telegraph noise (RTN) disturbing each link of the graph. Upon exploiting an exact code for the noisy dynamics, we evaluate the quantum non-Markovianity of the evolution, and show that it cannot be considered as a resource for this algorithm, since its presence is correlated with lower probabilities of success of the search.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121546015","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: 7
Phase estimation with squeezed single photons 压缩单光子的相位估计
Quantum Measurements and Quantum Metrology Pub Date : 2018-02-08 DOI: 10.1515/qmetro-2016-0007
S. Olivares, M. Popovic, M. Paris
{"title":"Phase estimation with squeezed single photons","authors":"S. Olivares, M. Popovic, M. Paris","doi":"10.1515/qmetro-2016-0007","DOIUrl":"https://doi.org/10.1515/qmetro-2016-0007","url":null,"abstract":"Abstract We address the performance of an interferometric setup in which a squeezed single photon interferes at a beam splitter with a coherent state. Our analysis in based on both the quantum Fisher information and the sensitivity when a Mach-Zehnder setup is considered and the difference photocurrent is detected at the output. We compare our results with those obtained feeding the interferometer with a squeezed vacuum (with the same squeezing parameter of the squeezed single photon) and a coherent state in order to have the same total number of photons circulating in the interferometer. We find that for fixed squeezing parameter and total number of photons there is a threshold of the coherent amplitude interfering with the squeezed single photon above which the squeezed single photons outperform the performance of squeezed vacuum (showing the highest quantum Fisher information). When the difference photocurrent measurement is considered, we can always find a threshold of the squeezing parameter (given the total number of photons and the coherent amplitude) above which squeezed single photons can be exploited to reach a better sensitivity with respect to the use of squeezed vacuum states also in the presence of non unit quantum efficiency.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121713123","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: 8
Super-thermal light for imaging applications 用于成像应用的超热光
Quantum Measurements and Quantum Metrology Pub Date : 2017-12-20 DOI: 10.1515/qmetro-2017-0004
A. Allevi, S. Cassina, M. Bondani
{"title":"Super-thermal light for imaging applications","authors":"A. Allevi, S. Cassina, M. Bondani","doi":"10.1515/qmetro-2017-0004","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0004","url":null,"abstract":"Abstract We report on a new classical light source useful for ghost-imaging applications. The light is obtained by frequency doubling a conventional speckle pattern having an overall multi-mode thermal distribution. The frequency-doubled light acquires a super-thermal distribution, which induces higher correlations at a beam splitter and, as a consequence, a higher visibility in ghost-imaging protocols.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116507400","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: 8
Quantum macroscopic nature of cat-like states 类猫态的量子宏观性质
Quantum Measurements and Quantum Metrology Pub Date : 2017-12-20 DOI: 10.1515/qmetro-2017-0010
A. Carlisle
{"title":"Quantum macroscopic nature of cat-like states","authors":"A. Carlisle","doi":"10.1515/qmetro-2017-0010","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0010","url":null,"abstract":"Abstract We investigate the macroscopic quantumness of a set of stateswell approximating the important class of coherent state-encoded Schrödinger cat states. We do so by using two different quantifiers of macroscopic quantumness, finding consistency between the results arising from the two quantifiers, despite the different grounds upon which they are built.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124341551","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: 0
Adaptive estimation and discrimination of Holevo-Werner channels Holevo-Werner信道的自适应估计与判别
Quantum Measurements and Quantum Metrology Pub Date : 2017-12-20 DOI: 10.1515/qmetro-2017-0006
Thomas Cope, S. Pirandola
{"title":"Adaptive estimation and discrimination of Holevo-Werner channels","authors":"Thomas Cope, S. Pirandola","doi":"10.1515/qmetro-2017-0006","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0006","url":null,"abstract":"Abstract The class of quantum states known as Werner states have several interesting properties, which often serve to illuminate unusual properties of quantum information. Closely related to these states are the Holevo- Werner channels whose Choi matrices are Werner states. Exploiting the fact that these channels are teleportation covariant, and therefore simulable by teleportation, we compute the ultimate precision in the adaptive estimation of their channel-defining parameter. Similarly, we bound the minimum error probability affecting the adaptive discrimination of any two of these channels. In this case, we prove an analytical formula for the quantum Chernoff bound which also has a direct counterpart for the class of depolarizing channels. Our work exploits previous methods established in [Pirandola and Lupo, PRL 118, 100502 (2017)] to set the metrological limits associated with this interesting class of quantum channels at any finite dimension.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116366899","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
Monitoring dispersive samples with single photons: the role of frequency correlations 用单光子监测色散样品:频率相关性的作用
Quantum Measurements and Quantum Metrology Pub Date : 2017-12-19 DOI: 10.1515/qmetro-2017-0008
E. Roccia, M. Genoni, Luca Mancino, I. Gianani, M. Barbieri, M. Sbroscia
{"title":"Monitoring dispersive samples with single photons: the role of frequency correlations","authors":"E. Roccia, M. Genoni, Luca Mancino, I. Gianani, M. Barbieri, M. Sbroscia","doi":"10.1515/qmetro-2017-0008","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0008","url":null,"abstract":"Abstract The physics that governs quantum monitoring may involve other degrees of freedom than the ones initialised and controlled for probing. In this context we address the simultaneous estimation of phase and dephasing characterizing a dispersive medium, and we explore the role of frequency correlations within a photon pair generated via parametric down-conversion, when used as a probe for the medium. We derive the ultimate quantum limits on the estimation of the two parameters, by calculating the corresponding quantum Cramér-Rao bound; we then consider a feasible estimation scheme, based on the measurement of Stokes operators, and address its absolute performances in terms of the correlation parameters, and, more fundamentally, of the role played by correlations in the simultaneous achievability of the quantum Cramér- Rao bounds for each of the two parameters.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"4 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120918185","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: 3
Channel Simulation in Quantum Metrology 量子计量中的信道仿真
Quantum Measurements and Quantum Metrology Pub Date : 2017-12-18 DOI: 10.1515/qmetro-2018-0001
Riccardo Laurenza, C. Lupo, G. Spedalieri, S. Braunstein, S. Pirandola
{"title":"Channel Simulation in Quantum Metrology","authors":"Riccardo Laurenza, C. Lupo, G. Spedalieri, S. Braunstein, S. Pirandola","doi":"10.1515/qmetro-2018-0001","DOIUrl":"https://doi.org/10.1515/qmetro-2018-0001","url":null,"abstract":"Abstract In this review we discuss how channel simulation can be used to simplify the most general protocols of quantum parameter estimation, where unlimited entanglement and adaptive joint operations may be employed. Whenever the unknown parameter encoded in a quantum channel is completely transferred in an environmental program state simulating the channel, the optimal adaptive estimation cannot beat the standard quantum limit. In this setting, we elucidate the crucial role of quantum teleportation as a primitive operation which allows one to completely reduce adaptive protocols over suitable teleportation-covariant channels and derive matching upper and lower bounds for parameter estimation. For these channels,wemay express the quantum Cramér Rao bound directly in terms of their Choi matrices. Our review considers both discrete- and continuous-variable systems, also presenting some new results for bosonic Gaussian channels using an alternative sub-optimal simulation. It is an open problem to design simulations for quantum channels that achieve the Heisenberg limit.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122824427","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: 30
Collision models in quantum optics 量子光学中的碰撞模型
Quantum Measurements and Quantum Metrology Pub Date : 2017-12-13 DOI: 10.1515/qmetro-2017-0007
F. Ciccarello
{"title":"Collision models in quantum optics","authors":"F. Ciccarello","doi":"10.1515/qmetro-2017-0007","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0007","url":null,"abstract":"Abstract Quantum collision models (CMs) provide advantageous case studies for investigating major issues in open quantum systems theory, and especially quantum non-Markovianity. After reviewing their general definition and distinctive features, we illustrate the emergence of a CM in a familiar quantum optics scenario. This task is carried out by highlighting the close connection between the well-known input-output formalism and CMs. Within this quantum optics framework, usual assumptions in the CMs’ literature - such as considering a bath of noninteracting yet initially correlated ancillas - have a clear physical origin.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131425364","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: 90
Wigner Function Reconstruction in Levitated Optomechanics 悬浮光学力学中的Wigner函数重构
Quantum Measurements and Quantum Metrology Pub Date : 2017-07-25 DOI: 10.1515/qmetro-2017-0003
Muddassar Rashid, M. Toroš, H. Ulbricht
{"title":"Wigner Function Reconstruction in Levitated Optomechanics","authors":"Muddassar Rashid, M. Toroš, H. Ulbricht","doi":"10.1515/qmetro-2017-0003","DOIUrl":"https://doi.org/10.1515/qmetro-2017-0003","url":null,"abstract":"Abstract We demonstrate the reconstruction of theWigner function from marginal distributions of the motion of a single trapped particle using homodyne detection. We show that it is possible to generate quantum states of levitated optomechanical systems even under the efect of continuous measurement by the trapping laser light. We describe the opto-mechanical coupling for the case of the particle trapped by a free-space focused laser beam, explicitly for the case without an optical cavity. We use the scheme to reconstruct the Wigner function of experimental data in perfect agreement with the expected Gaussian distribution of a thermal state of motion. This opens a route for quantum state preparation in levitated optomechanics.","PeriodicalId":421179,"journal":{"name":"Quantum Measurements and Quantum Metrology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123637688","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: 17
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信