Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society最新文献_第4页

Matter-screened Casimir force and Casimir Polder force in planar structures 平面结构中的物质屏蔽卡西米尔力和卡西米尔圩田力

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-16 DOI: 10.1088/1464-4266/7/12/024

C. Raabe, D. Welsch

引用次数: 3

Discrete Wigner function dynamics 离散维格纳函数动力学

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-16 DOI: 10.1088/1464-4266/7/12/022

A. Klimov, C. Muñoz

引用次数: 23

Decoherence and transfer of quantum states of field modes in a one-dimensional cavity with an oscillating boundary 具有振荡边界的一维腔中场模量子态的退相干和转移

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-04 DOI: 10.1088/1464-4266/7/12/006

V. Dodonov, M. A. Andreata, S. S. Mizrahi

{"title":"Decoherence and transfer of quantum states of field modes in a one-dimensional cavity with an oscillating boundary","authors":"V. Dodonov, M. A. Andreata, S. S. Mizrahi","doi":"10.1088/1464-4266/7/12/006","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/006","url":null,"abstract":"We study the evolution of Wigner functions of arbitrary initial quantum states of field modes in a one-dimensional ideal cavity, whose boundary performs small harmonic oscillations at the frequency ωW = pω1 (where ω1 is the fundamental field eigenfrequency). Special attention is paid to the case of initial even and odd coherent states, which serve as models of the 'Schrodinger cat states'. We show that the strong intermode interaction (due to the Doppler upshift of the fields reflected from the oscillating mirror) results in the decoherence of initial quantum superpositions in selected modes, even in the absence of any external 'environment'. Different quantitative measures of decoherence are discussed. The analytical solutions obtained show that any initial state of the field goes asymptotically to a highly mixed and moderately squeezed state in the 'principal resonance case' p = 2 and to the vacuum state in the 'semiresonance case' p = 1. It is shown that the decoherence process has several stages. In the first one, the interference between the components of the initial superposition is rapidly destroyed during the time of the primary decoherence, which is inversely proportional to the first power of the initial distance between the components, as opposed to the second power in the case of usual dissipative reservoirs. However, some weak traces of coherence (quantumness of states), such as the regions of negativity of the Wigner function, survive for much longer times, which do not depend on the size of the initial superposition.","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":"2005-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60914064","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

Decoherence of superpositions of displaced number states 置换数态叠加的退相干性

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-04 DOI: 10.1088/1464-4266/7/12/009

V. Dodonov, L. A. D. Souza

引用次数: 29

Simultaneous phase-sensitive parametric amplification and up-conversion of an optical image 光学图像的同步相敏参量放大和上转换

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-04 DOI: 10.1088/1464-4266/7/12/010

A. Chirkin, E. V. Makeev

引用次数: 12

Field-dependent atomic relaxation in a squeezed vacuum 压缩真空中与场相关的原子弛豫

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-01 DOI: 10.1088/1464-4266/7/11/004

S. Hassan, T. Jarad, R. Puri, R. Bullough

{"title":"Field-dependent atomic relaxation in a squeezed vacuum","authors":"S. Hassan, T. Jarad, R. Puri, R. Bullough","doi":"10.1088/1464-4266/7/11/004","DOIUrl":"https://doi.org/10.1088/1464-4266/7/11/004","url":null,"abstract":"The relaxation process of a single two-level atom driven by an intense resonant coherent field is studied in the presence of a broadband squeezed vacuum field. Generalized forms for the self-field operator and the field-dependent damping coefficients are derived. In the steady state, positive atomic inversion (~5%) is shown for some range of the phase of the squeezed vacuum field. The squeezing-induced enhanced and asymmetric coherence (i.e.?non-zero dispersive atomic polarization) induces profound asymmetry in the side-bands of the Mollow fluorescent spectrum and the absorptive?dispersive spectra near the Rabi side-band frequencies. The case of two and three cooperative atoms, instead of a single atom, shows (i)?positive atomic inversion in the steady state for larger interval of the squeeze phase parameter and more enhanced extrema for the atomic polarization components and (ii) the extra side peaks in the fluorescent spectrum become asymmetric and of dispersive-like profile. Dressed-state analysis in the single-atom case with the field-dependent decay process in the presence of the squeezed vacuum field is presented and shows that the inequality of the (field-dependent) decay rates of the dressed states leads to more positive inversion in the dressed states as compared with the normal vacuum case.","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":"2005-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/11/004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60913685","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

Mode structure of delay-coupled semiconductor lasers: influence of the pump current 延迟耦合半导体激光器的模式结构:泵浦电流的影响

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-01 DOI: 10.1088/1464-4266/7/11/008

H. Erzgräber, B. Krauskopf, D. Lenstra

引用次数: 15

Quantum entanglement in a system of two spatially separated atoms driven by an external coherent laser field 由外部相干激光场驱动的两个空间分离原子系统中的量子纠缠

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-11-01 DOI: 10.1088/1464-4266/7/11/003

Xiang-Ping Liao, M. Fang, Xiao-Mei Chen, Jian-Wu Cai, Xiao-Juan Zheng

引用次数: 8

Manipulating quantum information by propagation 通过传播来操纵量子信息

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-10-13 DOI: 10.1088/1464-4266/7/12/023

A. Perales, M. Plenio

引用次数: 13

Universal uncertainty principle in the measurement operator formalism 测量算符形式中的普遍不确定原理

Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-10-12 DOI: 10.1088/1464-4266/7/12/033

M. Ozawa

{"title":"Universal uncertainty principle in the measurement operator formalism","authors":"M. Ozawa","doi":"10.1088/1464-4266/7/12/033","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/033","url":null,"abstract":"Heisenberg's uncertainty principle has been understood to set a limitation on measurements; however, the long-standing mathematical formulation established by Heisenberg, Kennard, and Robertson does not allow such an interpretation. Recently, a new relation was found to give a universally valid relation between noise and disturbance in general quantum measurements, and it has become clear that the new relation plays a role of the first principle to derive various quantum limits on measurement and information processing in a unified treatment. This paper examines the above development on the noise–disturbance uncertainty principle in the model-independent approach based on the measurement operator formalism, which is widely accepted to describe a class of generalized measurements in the field of quantum information. We obtain explicit formulae for the noise and disturbance of measurements given by measurement operators, and show that projective measurements do not satisfy the Heisenberg-type noise–disturbance relation that is typical in the gamma-ray microscope thought experiments. We also show that the disturbance on a Pauli operator of a projective measurement of another Pauli operator constantly equals , and examine how this measurement violates the Heisenberg-type relation but satisfies the new noise–disturbance relation.","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":"2005-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60915603","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