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理论物理通讯：英文版

Entanglement Dynamics of Three Superconducting Charge Qubits Coupled to a Cavity

Zhao, Yujing, Xianwu, ■ Xiang, Shaohua, Zhou, Fang Fang, Song, Ke-Hui

Published Jan 1, 2011• 1 citation
OpenAlex

Abstract

我们调查由与微波域交往的三超导的费用 qubits (SCQ ) 组成的一个量系统的纠纷动力学。为 SCQ 的可分离、纠缠的状态，进化在洞地的各种各样的光子数字下面被学习。结果证明由两部组成的纠纷平方同时发生的振幅和时期能被 SCQ 的起始的状态和洞地的光子数字的选择分别地控制。一个量寄存器的这个简单模型允许我们理解费用 qubit 带的信息的量存储的动态过程。

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我们调查由与微波域交往的三超导的费用 qubits (SCQ ) 组成的一个量系统的纠纷动力学。为 SCQ 的可分离、纠缠的状态，进化在洞地的各种各样的光子数字下面被学习。结果证明由两部组成的纠纷平方同时发生的振幅和时期能被 SCQ 的起始的状态和洞地的光子数字的选择分别地控制。一个量寄存器的这个简单模型允许我们理解费用 qubit 带的信息的量存储的动态过程。
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。
We investigate the entanglement dynamics of a quantum system consisting of three superconducting charge qubits (SCQs) interacting with a microwave field. For separable and entangled states of the SCQs, the evolutions are studied under various photon numbers of cavity field. The results show that the amplitude and period of the bipartite entanglement square concurrences can be controlled by the choice of initial states of SCQs and photon number of cavity field, respectively. This simple model of a quantum register allows us to understand the dynamic process of the quantum storage of information carried by charge qubit.
基于联合到一个单个模式的微波洞的超导的费用 qubits (SCCQ ) ，我们为产生费用簇状态建议一个计划。为所有 SCCQ，控制的门电压都在他们的退化点，量信息被编码为充电的二个逻辑状态基础。multi-qubit 簇状态的产生能在一双近邻居的 qubits 上一步一步地被完成。就有效长戒指的联合而言，我们提供一个有效方法给一个高度纠缠的簇状态，联合的 qubit-qubit 被洞模式在调停产生的一步舞。我们的量操作对由经由系统的期刊进化移开洞模式的影响的洞模式的起始的状态感觉迟钝。因此，我们的操作可能对来自洞的 decoherence。
We investigate the entanglement dynamics of a quantum system consisting of three Superconducting charge qubits (SCQs) interacting with a single-mode cavity field. Considering the Rotating wave approximation (RWA) and the resonance condition, we give the effective Hamiltonian of the system involving cavity decay. The dynamical evolution is studied in terms of the entanglements in the different bipartite partitions of the system, as quantified by the square concurrence. With the choice of the appropriate initial states, a four-qubit W-entangled state can be obtained. We study the effect of cavity decay on various square concurrences in the system, the results show that the peak value of the square concurrence declines with the increase of cavity decay when the other parameters are fixed, but the cavity decay does not change the period of the square concurrence. We also find a natural entanglement transfer and entanglement invariant under evolution of the effective Hamiltonian.