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Chinese Physics Letters

Linear Entropy and Entanglement in Two-Charge-Qubit Circuits

廖庆洪, 方光宇, 王月媛, Ahmad, Muḥammad Muḥammad, Ashfaq, 刘树田

Published Jan 1, 2010• 1 citation
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Abstract

我们考虑包含二的一个模型由分享一个大 Josephson 连接联合了超导的费用 qubits。我们检验二 qubits 的线性熵和处于一个激动的状态的两 qubits 的概率的动态性质。结果证明起始的吝啬的光子数字，这块地的起始的阶段和二 qubit 的层次的相对阶段在二 qubits 和概率的线性熵的进化起一个重要作用。[从作者抽象]

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我们考虑包含二的一个模型由分享一个大 Josephson 连接联合了超导的费用 qubits。我们检验二 qubits 的线性熵和处于一个激动的状态的两 qubits 的概率的动态性质。结果证明起始的吝啬的光子数字，这块地的起始的阶段和二 qubit 的层次的相对阶段在二 qubits 和概率的线性熵的进化起一个重要作用。[从作者抽象]
The dynamics of entanglement of two superconducting charge qubit system interacting with a squeezed coherent state were examined by means of linear entropy. The influence of the relative phase of the two qubits' levels and squeezing parameter on the time evolution of linear entropy was discussed. The results showed that the linear entropy almost tends to zero at half the revival time when the two qubits were initially in the maximally entangled state. It was also showed that a greater number of oscillations of the linear entropy were observed with the increasing of squeezing parameter and the sustainment time of the maximum entropy was increased. There was no change in the maximum value of the linear entropy. Moreover,the relative phase of the two qubits' levels decreased the degree of entanglement between the two qubits and the field.