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arXiv quant-ph/0511115quant-phcond-mat.other
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多量子比特增强的动态纠缠转移

Enhanced dynamical entanglement transfer with multiple qubits

A. Serafini, M. Paternostro, M. S. Kim, S. Bose

摘要:

提出了两种利用多量子比特增强连续变量系统到有限维系统的动态纠缠转移的策略。首先,我们考虑了多个量子比特同时与二分CV场相互作用的复合有限维系统的纠缠转移。我们表明,考虑到现实条件下产生的CV纠缠,少量的量子比特共振耦合到CV系统是足够的纠缠的几乎完整的动力学转移。我们的分析还揭示了耦合到玻色子场的复合有限维系统(如原子云与光相互作用)的微观和宏观行为之间的过渡。此外,我们提出了一个协议的基础上的CV系统与一些辅助量子位系统和后续的测量顺序相互作用,允许概率转换CV纠缠成“几乎完美的”贝尔对两个量子位。我们的建议是适合在各种实验环境中实现,从腔QED腔集成超导设备。

英文摘要:

We present two strategies to enhance the dynamical entanglement transfer from continuous variable (CV) to finite dimensional systems by employing multiple qubits. First, we consider the entanglement transfer to a composite finite dimensional system of many qubits simultaneously interacting with a bipartite CV field. We show that, considering realistic conditions in the generation of CV entanglement, a small number of qubits resonantly coupled to the CV system is sufficient for an almost complete dynamical transfer of the entanglement. Our analysis also sheds further light on the transition between microscopic and macroscopic behaviours of composite finite dimensional systems coupled to bosonic fields (like atomic clouds interacting with light). Furthermore, we present a protocol based on sequential interactions of the CV system with some ancillary qubit systems and on subsequent measurements, allowing to probabilistically convert CV entanglement into `almost perfect' Bell pairs of two qubits. Our proposals are suited for realizations in various experimental settings, ranging from cavity-QED to cavity-integrated superconducting devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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