Preservation and enhancement of quantum correlations under Stark effect

IF 1.2 4区 物理与天体物理 Q4 OPTICS
N. Chandra, Rajiuddin Sk, P. Panigrahi
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引用次数: 0

Abstract

We analyse the dynamics of quantum correlations by obtaining the exact expression of Bures distance entanglement, trace distance discord, and local quantum uncertainty of two two-level atoms. Here, the atoms undergo two-photon transitions mediated through an intermediate virtual state where each atom is separately coupled to a dissipative reservoir at zero temperature in the presence of the Stark shift effect. We have investigated the dynamics of this atomic system for two different initial conditions of the environment. In the first case, we have assumed the environment's state to be in ground state and in the other case, we have assumed the state to be in the first excited state. The second initial condition is significant as it shows the role played by both the Stark shift parameters in contrast to only one of the Stark shift parameters for the first initial condition. Our results demonstrate that quantum correlations can be sustained for an extended period in the presence of Stark shift effect in the case of both Markovian and non-Markovian reservoirs. The effect in the non-Markovian reservoir is more prominent than the Markovian reservoir, even for a very small value of the Stark shift parameter. We observe that among the correlation measures considered, only local quantum uncertainty is accompanied by a sudden change phenomenon, i.e. an abrupt change in the decay rate of a correlation measure. Our findings are significant as preserving quantum correlations is one of the essential aspects in attaining optimum performance in quantum information tasks.
Stark效应下量子相关的保持与增强
我们通过得到两个二能级原子的布尔斯距离纠缠、迹距离不谐和局部量子不确定性的精确表达式来分析量子相关的动力学。在这里,原子通过中间虚态进行双光子跃迁,其中每个原子在存在斯塔克位移效应的情况下分别耦合到零温度下的耗散库。我们研究了这个原子系统在两种不同初始环境条件下的动力学。在第一种情况下,我们假设环境的状态是基态,在另一种情况下,我们假设环境的状态是第一激发态。第二个初始条件很重要,因为它显示了斯塔克位移参数所起的作用,而第一个初始条件只有一个斯塔克位移参数。我们的研究结果表明,在存在斯塔克位移效应的情况下,在马尔可夫和非马尔可夫储层中,量子相关性可以持续很长一段时间。即使斯塔克位移参数的值很小,非马尔可夫油藏的影响也比马尔可夫油藏更为突出。我们观察到,在考虑的相关测度中,只有局部量子不确定性伴随着突变现象,即相关测度衰减率的突变。我们的发现具有重要意义,因为保持量子相关性是在量子信息任务中获得最佳性能的基本方面之一。
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来源期刊
Journal of Modern Optics
Journal of Modern Optics 物理-光学
CiteScore
2.90
自引率
0.00%
发文量
90
审稿时长
2.6 months
期刊介绍: The journal (under its former title Optica Acta) was founded in 1953 - some years before the advent of the laser - as an international journal of optics. Since then optical research has changed greatly; fresh areas of inquiry have been explored, different techniques have been employed and the range of application has greatly increased. The journal has continued to reflect these advances as part of its steadily widening scope. Journal of Modern Optics aims to publish original and timely contributions to optical knowledge from educational institutions, government establishments and industrial R&D groups world-wide. The whole field of classical and quantum optics is covered. Papers may deal with the applications of fundamentals of modern optics, considering both experimental and theoretical aspects of contemporary research. In addition to regular papers, there are topical and tutorial reviews, and special issues on highlighted areas. All manuscript submissions are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. General topics covered include: • Optical and photonic materials (inc. metamaterials) • Plasmonics and nanophotonics • Quantum optics (inc. quantum information) • Optical instrumentation and technology (inc. detectors, metrology, sensors, lasers) • Coherence, propagation, polarization and manipulation (classical optics) • Scattering and holography (diffractive optics) • Optical fibres and optical communications (inc. integrated optics, amplifiers) • Vision science and applications • Medical and biomedical optics • Nonlinear and ultrafast optics (inc. harmonic generation, multiphoton spectroscopy) • Imaging and Image processing
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