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Chinese Physics Letters

Influence of Intrinsic Decoherence on Entanglement of Superconducting Charge Qubit in a Resonant Cavity

刘晓楠, 邵彬, 邹建

Published Jan 1, 2005• 0 citations
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Abstract

考虑内在的 decoherence 效果，我们在一个单个模式的光洞调查超导的费用 qubit 的纠纷动力学。作为联合地连接系统的纠纷的措施，同时发生是计算的。Incomparison，我们也由基于在相互的熵和部分 Von-Neumann 熵之间的比率使用纠纷参数调查内在的 decoherence 怎么影响联合系统的纠纷考虑系统的纠纷。我们的结果证明纠纷参数的进化有类似于同时发生的行为，它因此是为在如此的 a coupling 系统的混合状态的纠纷的井措施。

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我们在和一个单个模式的反响的洞题目的超导的费用 qubit 的相互作用的一个系统学习熵关联和纠纷的动力学到认为随机的阶段电报噪音同样二状态的噪音。我们证明尽管噪音在系统在纠纷上在 qubit 和这个领域并且也的熵的进化上有明显的压制效果，在 qubit 和这个领域之间的熵交换在系统的时间进化期间独立于它。

理论物理通讯：英文版•Jan 1, 2011•0 citations
考虑内在的 decoherence 效果，我们在一个单个模式的光洞调查超导的费用 qubit 的纠纷动力学。作为联合地连接系统的纠纷的措施，同时发生是计算的。Incomparison，我们也由基于在相互的熵和部分 Von-Neumann 熵之间的比率使用纠纷参数调查内在的 decoherence 怎么影响联合系统的纠纷考虑系统的纠纷。我们的结果证明纠纷参数的进化有类似于同时发生的行为，它因此是为在如此的 a coupling 系统的混合状态的纠纷的井措施。
由考虑内在的 decoherence 效果，我们在联合到一个单个模式的光洞的超导的费用 qubit 的交往的系统调查熵交换和纠纷。尽管内在的 decoherence 通过密度操作员的离开斜的矩阵元素的腐烂由于协调的量特征的抑制导致交往的系统的不可逆的进化，并且有，我们发现了那一显然在二部件的分系统的部分熵上影响，它剂量别破坏熵交换行为。另外，作为联合系统的纠纷的措施，同时发生的更低的界限是计算的。纠纷的进化对内在的 decoherence 的变化敏感，这被显示出。
Taking the intrinsic decoherence effect into account, we investigate the entanglement dynamics of a superconducting charge qubit in a single-mode optical cavity. Concurrence, as the measure of entanglement of the coupled field-junction system, is calculated. In comparison, we also consider the entanglement of the system by using the entanglement parameter based on the ratio between mutual entropy and partial Von-Neumann entropy to investigate how the intrinsic decoherence affects the entanglement of the coupling system. Our results show that the evolution of the entanglement parameter has the behaviour similar to the concurrence and it is thus the well measure of entanglement for the mixed state in such a coupling system.
By considering the intrinsic decoherence effect, we investigate the entropy exchange and entanglement in the interacting system of a superconducting charge qubit coupled to a single-mode optical cavity. We found that although the intrinsic decoherence leads to an irreversible evolution of the interacting system due to a suppression of coherent quantum features through the decay of off-diagonal matrix elements of the density operator, and has an apparently influence on the partial entropies of the two-component subsystems, it dose not destroy entropy exchange behavior. In addition, the lower bound of the concurrence, as the measure of entanglement of the coupling system, is calculated. It is shown that the evolution of entanglement is sensitive to the change of the intrinsic decoherence.