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理论物理通讯：英文版

Entanglement Dynamics of Two-Qubit System in Different Types of Noisy Channels

Shan Shan, Chuan-Jia, Liu ., Ji-Bing, Cheng Cheng, Wei-Wen, Tang-Kun, Huang, Yanxia, LI ., Hong

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

在这篇论文，我们学习 two-qubit 的纠纷动力学局部地与独立吵闹的隧道交往的扩大象 Werner 一样状态，即，抑制，阶段抑制，并且动摇的振幅隧道。我们证明起始的纠缠的状态的纯净在每条吵闹的隧道在纠纷坚韧性上有直接影响。也就是说如果起始的纠缠的状态被准备在混合了而不是纯形式，状态可以展出纠纷突然的死亡(ESD ) 或为在的批评概率被减少纠纷消失。

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在这篇论文，我们学习 two-qubit 的纠纷动力学局部地与独立吵闹的隧道交往的扩大象 Werner 一样状态，即，抑制，阶段抑制，并且动摇的振幅隧道。我们证明起始的纠缠的状态的纯净在每条吵闹的隧道在纠纷坚韧性上有直接影响。也就是说如果起始的纠缠的状态被准备在混合了而不是纯形式，状态可以展出纠纷突然的死亡(ESD ) 或为在的批评概率被减少纠纷消失。
我们在各种各样的消散的隧道的影响下面在一个混合 qubit-qutrit 系统为状态的一个二参数的类调查纠纷的动力学。我们的结果显示出突然的死亡(ESD ) 是的那件纠纷一般现象和它通常在与其它观察的 dephasing 和动摇隧道与各种各样的吵闹的隧道，不是仅仅案例交往的一个 qubit-qutrit 系统发生。ESD 能仅仅在一些特别吵闹的隧道下面为一些开始纠缠的状态被避免。而且，环境以很不同的方法影响纠纷和系统的连贯。
In this paper, we study entanglement dynamics of a two-qubit extended Werner-like state locally interacting with independent noisy channels, i.e., amplitude damping, phase damping, and depolarizing channels. We show that the purity of initial entangled state has direct impacts on the entanglement robustness in each noisy channel. That is, if the initial entangled state is prepared in mixed instead of pure form, the state may exhibit entanglement sudden death (ESD) and/or be decreased for the critical probability at which the entanglement disappear.
We investigate the dynamics of entanglement for a two-parameter class of states in a hybrid qubit-qutrit system under the influence of various dissipative channels. Our results show that entanglement sudden death (ESD) is a general phenomenon and it usually takes place in a qubit-qutrit system interacting with various noisy channels, not only the case with dephasing and depolarizing channels observed by others. ESD can only be avoided for some initially entangled states under some particular noisy channels. Moreover, the environment affects the entanglement and the coherence of the system in very different ways.
Quantum entanglement, a key resource in quantum information processing, is reduced by interaction between the quantum system concerned and its unavoidable noisy environment. Therefore it is of particular importance to study the dynamical properties of entanglement in open quantum systems. In this work, we mainly focus on two qubits coupled to an adjustable environment, namely a semi-infinite transmission line. The two qubits’ relaxations, through individual channels or collective channel or both, can be adjusted by the qubits’ transition frequencies. We examine entanglement dynamics in this model system with initial Werner state, and show that the phenomena of entanglement sudden death and revival can be observed. Due to the hardness of preparing the Werner state experimentally, we introduce a new type of entangled state called pseudo-Werner state, which preserves as much entangling property as the Werner state, and more importantly, it is experiment friendly. Furthermore, we provide detailed procedures for generating pseudo-Werner state and studying entanglement dynamics with it, which can be straightforwardly implemented in a superconducting waveguide quantum electrodynamics system.