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Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society最新文献

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The n-partite entangled Wigner operator and its applications in Wigner function n部纠缠Wigner算子及其在Wigner函数中的应用
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-08-02 DOI: 10.1088/1464-4266/7/9/005
Nian-quan Jiang
{"title":"The n-partite entangled Wigner operator and its applications in Wigner function","authors":"Nian-quan Jiang","doi":"10.1088/1464-4266/7/9/005","DOIUrl":"https://doi.org/10.1088/1464-4266/7/9/005","url":null,"abstract":"For an n-partite entangled system, based on the newly constructed n-partite EPR entangled state for continuous variables, we find the entangled state representation of the n-mode Wigner operator, using it we have conveniently discussed the Wigner function of some entangled states.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/9/005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60920535","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
Interference effects in a model of two-channel photon absorption by a collection of two-level atoms 双能级原子集合的双通道光子吸收模型中的干涉效应
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-08-01 DOI: 10.1088/1464-4266/7/8/L01
C. Gerry
{"title":"Interference effects in a model of two-channel photon absorption by a collection of two-level atoms","authors":"C. Gerry","doi":"10.1088/1464-4266/7/8/L01","DOIUrl":"https://doi.org/10.1088/1464-4266/7/8/L01","url":null,"abstract":"I study a model of photon absorption by a collection of two-level atoms interacting resonantly with two degenerate modes of the quantized electromagnetic field. The two fields provide two channels by which the atoms may be excited and the interference between these channels gives rise to nontrivial steady states, the trivial state just being the two-mode vacuum. The model studied is soluble.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/8/L01","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60920074","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
Quantization of the electromagnetic field in uniaxial crystalline dielectric media: long-wave limit 单轴晶体介质中电磁场的量子化:长波极限
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-08-01 DOI: 10.1088/1464-4266/7/8/001
V. Peřinová, A. Luks
{"title":"Quantization of the electromagnetic field in uniaxial crystalline dielectric media: long-wave limit","authors":"V. Peřinová, A. Luks","doi":"10.1088/1464-4266/7/8/001","DOIUrl":"https://doi.org/10.1088/1464-4266/7/8/001","url":null,"abstract":"The derivation of the relative electric permittivity tensor from a fully classical model is known, and a calculation of this quantity from a semiclassical model in the first order of perturbation theory is familiar as well. In applications to commonly occurring uniaxial crystalline media without optical activity, the whole discrete lattice is represented by a single atomic oscillator. We calculate the relative electric permittivity tensor provided that the discrete lattice can be represented by a continuum of quantum harmonic oscillators.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/8/001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60919295","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
Adaptive phase measurements in linear optical quantum computation 线性光学量子计算中的自适应相位测量
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-20 DOI: 10.1088/1464-4266/7/10/007
T. Ralph, A. Lund, H. Wiseman
{"title":"Adaptive phase measurements in linear optical quantum computation","authors":"T. Ralph, A. Lund, H. Wiseman","doi":"10.1088/1464-4266/7/10/007","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/007","url":null,"abstract":"Photon counting induces an effective non-linear optical phase shift in certain states derived by linear optics from single photons. Although this non-linearity is non-deterministic, it is sufficient in principle to allow scalable linear optics quantum computation (LOQC). The most obvious way to encode a qubit optically is as a superposition of the vacuum and a single photon in one mode-so-called 'single-rail' logic. Until now this approach was thought to be prohibitively expensive (in resources) compared to 'dual-rail' logic where a qubit is stored by a photon across two modes. Here we attack this problem with real-time feedback control, which can realize a quantum-limited phase measurement on a single mode, as has been recently demonstrated experimentally. We show that with this added measurement resource, the resource requirements for single-rail LOQC are not substantially different from those of dual-rail LOQC. In particular, with adaptive phase measurements an arbitrary qubit state a alpha/0 > + beta/1 > can be prepared deterministically.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60911664","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: 25
Many-particle confinement by constructed disorder and quantum computing 构造无序与量子计算的多粒子约束
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-20 DOI: 10.1088/1464-4266/7/10/024
M. Dykman, L. F. Santos, M. Shapiro
{"title":"Many-particle confinement by constructed disorder and quantum computing","authors":"M. Dykman, L. F. Santos, M. Shapiro","doi":"10.1088/1464-4266/7/10/024","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/024","url":null,"abstract":"Many-particle confinement (localization) is studied for a 1D system of spinless fermions with nearest-neighbour hopping and interaction, or equivalently, for an anisotropic Heisenberg spin-1/2 chain. This system is frequently used to model quantum computers with perpetually coupled qubits. We construct a bounded sequence of site energies that leads to strong single-particle confinement of all states on individual sites. We show that this sequence also leads to a confinement of all many-particle states in an infinite system for a time that scales as a high power of the reciprocal hopping integral. The confinement is achieved for strong interaction between the particles while keeping the overall bandwidth of site energies comparatively small. The results show the viability of quantum computing with time-independent qubit coupling.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60912247","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
Thermalization of squeezed states 压缩态的热化
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-14 DOI: 10.1088/1464-4266/7/12/015
A. Solomon
{"title":"Thermalization of squeezed states","authors":"A. Solomon","doi":"10.1088/1464-4266/7/12/015","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/015","url":null,"abstract":"Starting with a thermal squeezed state defined as a conventional thermal state based on an appropriate Hamiltonian, we show how an important physical property, the signal-to-noise ratio, is degraded, and propose a simple model of thermalization (Kraus thermalization).","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60914686","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
Transferring a cavity field entangled state in cavity QED 在腔QED中传递腔场纠缠态
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-11 DOI: 10.1088/1464-4266/7/8/002
L. Ye, L. Ye, G. Guo
{"title":"Transferring a cavity field entangled state in cavity QED","authors":"L. Ye, L. Ye, G. Guo","doi":"10.1088/1464-4266/7/8/002","DOIUrl":"https://doi.org/10.1088/1464-4266/7/8/002","url":null,"abstract":"We propose a scheme for transferring an entanglement of zero- and one-photon states from one cavity to another. The scheme, which has 100% success probability, is mainly based on a two-mode cavity dispersively interacting with a three-level atom in the Λ configuration and does not involve Bell-state measurement. This scheme can also be used to teleport an unknown atomic state.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/8/002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60919362","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
Correlation of time intervals for random point processes 随机点过程时间间隔的相关性
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-11 DOI: 10.1088/1464-4266/7/8/003
C. Bendjaballah
{"title":"Correlation of time intervals for random point processes","authors":"C. Bendjaballah","doi":"10.1088/1464-4266/7/8/003","DOIUrl":"https://doi.org/10.1088/1464-4266/7/8/003","url":null,"abstract":"Various random point processes occurring in the detection of photons in different states are considered. Statistics of the times between these points and their correlation are analysed.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/8/003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60919511","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
Strategies for real-time position control of a single atom in cavity QED 腔QED中单原子实时位置控制策略
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-07 DOI: 10.1088/1464-4266/7/10/004
T. Lynn, K. Birnbaum, H. Kimble
{"title":"Strategies for real-time position control of a single atom in cavity QED","authors":"T. Lynn, K. Birnbaum, H. Kimble","doi":"10.1088/1464-4266/7/10/004","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/004","url":null,"abstract":"Recent realizations of single-atom trapping and tracking in cavity QED open the door for feedback schemes which actively stabilize the motion of a single atom in real time. We present feedback algorithms for cooling the radial component of motion for a single atom trapped by strong coupling to single-photon fields in an optical cavity. Performance of various algorithms is studied through simulations of single-atom trajectories, with full dynamical and measurement noise included. Closed loop feedback algorithms compare favourably to open loop 'switching' analogues, demonstrating the importance of applying actual position information in real time. The high optical information rate in current experiments enables real-time tracking that approaches the standard quantum limit for broadband position measurements, suggesting that realistic active feedback schemes may reach a regime where measurement backaction appreciably alters the motional dynamics.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60910786","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: 10
Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation 双模高斯态的纠缠:表征和实验产生与操作
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-07 DOI: 10.1088/1464-4266/7/12/021
J. Laurat, G. Keller, J. Oliveira-Huguenin, C. Fabre, T. Coudreau, A. Serafini, G. Adesso, F. Illuminati
{"title":"Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation","authors":"J. Laurat, G. Keller, J. Oliveira-Huguenin, C. Fabre, T. Coudreau, A. Serafini, G. Adesso, F. Illuminati","doi":"10.1088/1464-4266/7/12/021","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/021","url":null,"abstract":"A powerful theoretical structure has emerged in recent years on the characterization and quantification of entanglement in continuous-variable systems. After reviewing this framework, we will illustrate it with an original set-up based on a type-II OPO (optical parametric oscillator) with adjustable mode coupling. Experimental results allow a direct verification of many theoretical predictions and provide a sharp insight into the general properties of two-mode Gaussian states and entanglement resource manipulation.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60914533","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: 130
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