Frequency modulation-controlled Einstein–Podolsky–Rosen steering in leaky cavities

IF 2.2 3区 物理与天体物理 Q1 PHYSICS, MATHEMATICAL
S. J. Chen, D. C. Qian, Y. H. Sun, M. K. Wu, W. W. Cheng
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引用次数: 0

Abstract

Numerous strategies have been proposed to manipulate and protect symmetric quantum correlations from decoherence. However, there needs to be more emphasis on asymmetric ones, such as Einstein–Podolsky–Rosen (EPR) steering. In this study, we delve into EPR steering between two frequency-modulated qubits coupled to a zero-temperature reservoir individually, in both weak and strong coupling regimes. We consider a scenario where each qubit is locally identically coupled to its environment. The results demonstrate that the decay of EPR steering between the two qubits can be delayed remarkably by controlling frequency modulation parameters, regardless of whether the system exhibits Markovian or non-Markovian behavior. Moreover, we observe that a precise balance between modulation strength \(\delta \) and frequency \(\varOmega \), determining the zeros of the Bessel function \(J_{0}(\delta /\varOmega )\), can significantly enhance EPR steering in the strong coupling regime. Furthermore, we investigate the asymmetric nature of EPR steering by examining a scenario where one of the qubits remains unmodulated. We thoroughly analyze the impact of modulation parameters on the occurrence of EPR steering sudden death. The findings highlight that asymmetry properties, such as one-way and two-way steering, can be effectively manipulated by adjusting the frequency modulation parameters, even when the initial two-qubit state is symmetrical. These results suggest that it is feasible to safeguard EPR steering and control its asymmetry properties without requiring additional quantum resources.

频率调制控制的爱因斯坦-波多尔斯基-罗森导向在漏腔中
已经提出了许多策略来操纵和保护对称量子相关免受退相干的影响。然而,需要更多地强调不对称的,比如爱因斯坦-波多尔斯基-罗森(EPR)转向。在这项研究中,我们深入研究了两个频率调制量子比特在弱耦合和强耦合状态下分别与零温度储层耦合的EPR转向。我们考虑一种场景,其中每个量子位在本地与其环境相同地耦合。结果表明,无论系统表现为马尔可夫行为还是非马尔可夫行为,通过控制调频参数都可以显著延迟两个量子比特之间EPR转向的衰减。此外,我们观察到调制强度\(\delta \)和频率\(\varOmega \)之间的精确平衡,确定贝塞尔函数\(J_{0}(\delta /\varOmega )\)的零点,可以显著增强强耦合状态下的EPR转向。此外,我们通过检查其中一个量子位保持未调制的情况来研究EPR转向的不对称性质。深入分析了调制参数对EPR转向猝死发生的影响。研究结果强调,即使初始双量子位状态是对称的,也可以通过调整调频参数来有效地控制单向和双向转向等不对称特性。这些结果表明,在不需要额外量子资源的情况下,保护EPR转向和控制其不对称性质是可行的。
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来源期刊
Quantum Information Processing
Quantum Information Processing 物理-物理:数学物理
CiteScore
4.10
自引率
20.00%
发文量
337
审稿时长
4.5 months
期刊介绍: Quantum Information Processing is a high-impact, international journal publishing cutting-edge experimental and theoretical research in all areas of Quantum Information Science. Topics of interest include quantum cryptography and communications, entanglement and discord, quantum algorithms, quantum error correction and fault tolerance, quantum computer science, quantum imaging and sensing, and experimental platforms for quantum information. Quantum Information Processing supports and inspires research by providing a comprehensive peer review process, and broadcasting high quality results in a range of formats. These include original papers, letters, broadly focused perspectives, comprehensive review articles, book reviews, and special topical issues. The journal is particularly interested in papers detailing and demonstrating quantum information protocols for cryptography, communications, computation, and sensing.
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