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理论物理通讯：英文版

Quantum Measurement of Two-Qubit System in Damping Noise Environment

杨青, 刘慧, 甄秀兰, 杨名, 曹卓良

Published Jan 1, 2016• 0 citations

Abstract

有他们的环境的纠缠的 qubits 的不可避免的相互作用可以导致量关联的降级，这被知道。我们在一般本地站在一起单人赛、两方面的抑制振幅的隧道(模数转换器) 下面学习二遥远的 qubits 的 decoherence。由使用同时发生，量不一致和 ClauserHorneShimonyHolt (CHSH ) 不平等，我们发现在剩余量关联之间的关系和起始的是不同的。最近，王等。[Int。J。Theor。Phys。54 (2015 ) 5 ] 在那里显示出那存在以剩余量关联是比最大地纠缠的状态更柔韧的一套部分纠缠的状态分别地由同时发生，充分纠缠的部分和量不一致测量了。这里，我们在站在一起单人赛、两方面的模数转换器发现那两个，仅仅有起始的参数的 CHSH 不平等的进化与起始的 nonlocality 的成正比。那意味着起始的状态与最大地， nonlocality 将在进化保留它的角色。它暗示 nonlocality 的进化可以更好揭示量状态的特征。而且，我们在抑制隧道(GADC ) 的概括振幅下面与起始的参数讨论三不同的量大小的进化并且发现他们都与起始的状态的成正比。

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有他们的环境的纠缠的 qubits 的不可避免的相互作用可以导致量关联的降级，这被知道。我们在一般本地站在一起单人赛、两方面的抑制振幅的隧道(模数转换器) 下面学习二遥远的 qubits 的 decoherence。由使用同时发生，量不一致和 ClauserHorneShimonyHolt (CHSH ) 不平等，我们发现在剩余量关联之间的关系和起始的是不同的。最近，王等。[Int。J。Theor。Phys。54 (2015 ) 5 ] 在那里显示出那存在以剩余量关联是比最大地纠缠的状态更柔韧的一套部分纠缠的状态分别地由同时发生，充分纠缠的部分和量不一致测量了。这里，我们在站在一起单人赛、两方面的模数转换器发现那两个，仅仅有起始的参数的 CHSH 不平等的进化与起始的 nonlocality 的成正比。那意味着起始的状态与最大地， nonlocality 将在进化保留它的角色。它暗示 nonlocality 的进化可以更好揭示量状态的特征。而且，我们在抑制隧道(GADC ) 的概括振幅下面与起始的参数讨论三不同的量大小的进化并且发现他们都与起始的状态的成正比。

Abstract It is known that the inevitable interaction of the entangled qubits with their environments may result in the degradation of quantum correlation. We study the decoherence of two remote qubits under general local single- and two-sided amplitude-damping channel (ADC). By using concurrence, quantum discord and Clauser–Horne–Shimony–Holt (CHSH) inequality, we find that the relation between the residual quantum correlations and the initial ones are different. Recently, Wang et al. [Int. J. Theor. Phys. 54 (2015) 5] showed that there exist a set of partially entangled states that are more robust than maximally entangled states in terms of the residual quantum correlation measured by concurrence, fully entangled fraction and quantum discord, respectively. Here we find that both in single- and two-sided ADC, only the evolution of CHSH inequality with the initial parameter is proportional to that of the initial nonlocality. That means the initial state with maximally nonlocality will retain its role in the evolution. It implies that the evolution of nonlocality may reveal the characteristics of quantum state better. Furthermore, we discuss the evolutions of the three different quantum measurements with the initial parameter under generalized amplitude damping channel (GADC) and find that they are all proportional to that of the initial state.

Abstract We investigate the Bell nonlocality dynamics of bipartite quantum systems under three distinct types of global decoherence environments: global amplitude damping noise, globally correlated classical noise, and global phase-damping noise. By combining numerical optimization techniques over Bell inequalities—specifically the Clauser–Horne–Shimony–Holt inequality—and describing the global noise-evolution process of a two-qubit system with the Kraus operator formalism, we systematically characterize the evolution of quantum nonlocality in a two-qubit system. Our results demonstrate that, under a global amplitude damping noise environment, precise temporal modulation of the amplitude damping channel enables the composite system to retain maximal Bell-nonlocal correlations in its final state. In contrast, globally correlated classical noise fields induce exponential suppression of Bell inequality violations. Remarkably, the systems subjected to global phase-damping noise exhibit pronounced robustness to nonlocality. These findings highlight the critical role of global noise in nonlocality dynamics.