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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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Nonlocality without inequalities 无不等式的非定域性
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-28 DOI: 10.1088/1464-4266/7/12/029
G. Ghirardi, L. Marinatto
{"title":"Nonlocality without inequalities","authors":"G. Ghirardi, L. Marinatto","doi":"10.1088/1464-4266/7/12/029","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/029","url":null,"abstract":"We prove that every conceivable hidden variable model reproducing the quantum mechanical predictions of almost any entangled state must necessarily violate Bell's locality condition. The proof does not involve the consideration of any Bell inequality but it rests on simple set theoretic arguments and it works for almost any non-completely factorizable state vector associated to any number of particles whose Hilbert spaces have arbitrary dimensionality.","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":"2005-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/029","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60914942","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
Revealing virtual processes of a quantum Brownian particle in phase space 揭示相空间中量子布朗粒子的虚过程
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-26 DOI: 10.1088/1464-4266/7/10/028
S. Maniscalco
{"title":"Revealing virtual processes of a quantum Brownian particle in phase space","authors":"S. Maniscalco","doi":"10.1088/1464-4266/7/10/028","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/028","url":null,"abstract":"The short-time dynamics of a quantum Brownian particle in a harmonic potential is studied in phase space. An exact non-Markovian analytic approach to calculate the time evolution of the Wigner function is presented. The dynamics of the Wigner function of an initially squeezed state is analysed. It is shown that virtual exchanges of energy between the particle and the reservoir, characterizing the non-Lindblad short-time dynamics where system–reservoir correlations are not negligible, show up in phase space.","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":"2005-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60912526","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
Controllable surfaces of path interference in the multiphoton ionization of atoms by a weak trichromatic field 弱三色场原子多光子电离中路径干涉的可控表面
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-26 DOI: 10.1088/1464-4266/7/10/029
T. Mercouris, C. Nicolaides
{"title":"Controllable surfaces of path interference in the multiphoton ionization of atoms by a weak trichromatic field","authors":"T. Mercouris, C. Nicolaides","doi":"10.1088/1464-4266/7/10/029","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/029","url":null,"abstract":"Multiphoton detachment rates for the H− 1S ground state irradiated by a weak trichromatic ac field consisting of the fundamental frequency ω = 0.272 eV and its second, third or fourth higher harmonics were computed from first principles. The weak intensities are in the range of 107–108 W cm−2. The calculations incorporated systematically electronic structure and electron correlation effects. They were done by implementing a time-independent, nonperturbative many-electron, many-photon theory (MEMPT) which obtains cycle-averaged complex eigenvalues, whose real part gives the field-induced energy shift, Δ, and the imaginary part is the multiphoton ionization rate, Γ. Through analysis, plausible arguments and computation, we show that when the intensities are weak the dependence of Γ on phase differences is simple. Specifically, Γs are depicted in the form of plane surfaces, with minor ripples due to higher order ionization paths, in terms of trigonometric functions of the phase differences. This dependence is likely to be applicable to other atomic systems as well, and to provide a definition of the weak field regime in the trichromatic case. When the field intensities are such that higher order ionization paths become important, these dependences break down and we reach the strong field regime.","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":"2005-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/029","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60912778","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
Characterization of bipartite states using a single homodyne detector 用单同差检测器表征二部态
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-26 DOI: 10.1088/1464-4266/7/12/044
V. D’Auria, A. Porzio, S. Solimeno, S. Olivares, M. Paris
{"title":"Characterization of bipartite states using a single homodyne detector","authors":"V. D’Auria, A. Porzio, S. Solimeno, S. Olivares, M. Paris","doi":"10.1088/1464-4266/7/12/044","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/044","url":null,"abstract":"We suggest a scheme to reconstruct the covariance matrix of a two-mode state using a single homodyne detector plus a polarizing beam splitter and a polarization rotator. It can be used to fully characterize bipartite Gaussian states and to extract relevant information on generic 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":"2005-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60916071","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: 31
Initial steps towards quantum control of atomic Bose–Einstein condensates 原子玻色-爱因斯坦凝聚体量子控制的初步步骤
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-26 DOI: 10.1088/1464-4266/7/10/031
S. Choi, N. Bigelow
{"title":"Initial steps towards quantum control of atomic Bose–Einstein condensates","authors":"S. Choi, N. Bigelow","doi":"10.1088/1464-4266/7/10/031","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/031","url":null,"abstract":"There exists a large body of experimental and theoretical work carried out on Bose–Einstein condensates (BECs) of dilute alkali atoms since their first creation some ten years ago. Much of this work, although not stated explicitly, involves exciting initial steps for the quantum control of coherent matter waves. In this paper, we shall discuss some examples of the experimental and theoretical work on BECs from the perspective of quantum control.","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":"2005-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60913115","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
Storing quantum information in XXZ spin rings with periodically time-controlled interactions 在具有周期性时间控制相互作用的XXZ自旋环中存储量子信息
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-21 DOI: 10.1088/1464-4266/7/10/019
S. Giampaolo, F. Illuminati, G. Mazzarella
{"title":"Storing quantum information in XXZ spin rings with periodically time-controlled interactions","authors":"S. Giampaolo, F. Illuminati, G. Mazzarella","doi":"10.1088/1464-4266/7/10/019","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/019","url":null,"abstract":"We introduce a general scheme to realize massive quantum memories in simple systems of interacting qubits. Such systems are described by spin rings with XXZ intersite couplings of suitably time-periodically controlled amplitudes. We show that initially localized excitations undergo perfect periodic revivals, allowing for the simultaneous storage of arbitrary sets of different local states. This novel approach to the problem of storing quantum information hints at a new way to control and suppress the effect of decoherence on a quantum computer realized in a system with nonvanishing interactions between the constituent qubits.","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":"2005-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60912037","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
Strong field quantum control by selective population of dressed states 选择性衣态居群的强场量子控制
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-15 DOI: 10.1088/1464-4266/7/10/010
M. Wollenhaupt, A. Präkelt, C. Sarpe-Tudoran, D. Liese, T. Baumert
{"title":"Strong field quantum control by selective population of dressed states","authors":"M. Wollenhaupt, A. Präkelt, C. Sarpe-Tudoran, D. Liese, T. Baumert","doi":"10.1088/1464-4266/7/10/010","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/010","url":null,"abstract":"We study the dynamics of potassium atoms in intense laser fields using femtosecond phase-locked pulse pairs in order to extract physical mechanisms of strong field quantum control. The structure of the Autler–Townes (AT) doublet in the photoelectron spectra is measured to analyse transient processes. The analysis shows that the physical mechanism is based on the selective population of dressed states (SPODS). Experimental results of closed loop optimization of SPODS are presented in addition. Applications to decoherence measurements with implications for quantum information are also proposed.","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":"2005-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60911297","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: 56
REVIEW ARTICLE: Modelling and feedback control design for quantum state preparation 综述文章:量子态制备的建模和反馈控制设计
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-14 DOI: 10.1088/1464-4266/7/10/001
R. Handel, John K. Stockton, H. Mabuchi
{"title":"REVIEW ARTICLE: Modelling and feedback control design for quantum state preparation","authors":"R. Handel, John K. Stockton, H. Mabuchi","doi":"10.1088/1464-4266/7/10/001","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/001","url":null,"abstract":"The goal of this article is to provide a largely self-contained introduction to the modelling of controlled quantum systems under continuous observation, and to the design of feedback controls that prepare particular quantum states. We describe a bottom-up approach, where a field-theoretic model is subjected to statistical inference and is ultimately controlled. As an example, the formalism is applied to a highly idealized interaction of an atomic ensemble with an optical field. Our aim is to provide a unified outline for the modelling, from first principles, of realistic experiments in quantum control.","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":"2005-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60911071","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: 89
Remote implementation of quantum operations 量子操作的远程实现
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-08 DOI: 10.1088/1464-4266/7/10/026
S. Huelga, M. Plenio, G. Xiang, Jian Li, G. Guo
{"title":"Remote implementation of quantum operations","authors":"S. Huelga, M. Plenio, G. Xiang, Jian Li, G. Guo","doi":"10.1088/1464-4266/7/10/026","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/026","url":null,"abstract":"Shared entanglement allows, under certain conditions, the remote implementation of quantum operations. We revise and extend recent theoretical results on the remote control of quantum systems as well as experimental results on the remote manipulation of photonic qubits via linear optical elements.","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":"2005-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60912278","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: 23
Non-local properties of a symmetric two-qubit system 对称双量子位系统的非局域性质
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-09-02 DOI: 10.1088/1464-4266/7/12/042
A. Devi, M. S. Uma, R. Prabhu, Sudha
{"title":"Non-local properties of a symmetric two-qubit system","authors":"A. Devi, M. S. Uma, R. Prabhu, Sudha","doi":"10.1088/1464-4266/7/12/042","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/042","url":null,"abstract":"Non-local properties of symmetric two-qubit states are quantified in terms of a complete set of entanglement invariants. We prove that negative values of some of the invariants are signatures of quantum entanglement. This leads us to identify sufficient conditions for non-separability in terms of entanglement invariants. Non-local properties of two-qubit states extracted from (i) the Dicke state, (ii) a state generated by a one-axis twisting Hamiltonian, and (iii) a one-dimensional Ising chain with nearest neighbour interaction are analysed in terms of the invariants characterizing them.","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":"2005-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60916010","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: 12
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