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arXiv quant-ph/0307106quant-ph
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连续变量纠缠的光学蒸馏

Distillation of continuous-variable entanglement with optical means

J. Eisert, D. E. Browne, S. Scheel, M. B. Plenio

摘要:

我们提出了一个事件准备的程序,能够蒸馏高斯双模纠缠态从供应的弱纠缠态,已成为混合在退相干过程中。该过程依赖于无源光学元件和光子检测器来区分光子的存在和不存在,但不使用光子计数器。我们确定了迭代映射的不动点,并详细讨论了它的收敛性。给出了收敛到双模高斯态的充分必要条件。在各种例子的基础上,我们讨论了该方法在增加纠缠度和双模压缩方面的性能。最后,我们考虑不完美的操作,并概述了该计划下的非单位检测器的检测效率的鲁棒性。这一分析意味着,所提出的协议可以实现与目前可用的技术和检测器的效率。

英文摘要:

We present an event-ready procedure that is capable of distilling Gaussian two-mode entangled states from a supply of weakly entangled states that have become mixed in a decoherence process. This procedure relies on passive optical elements and photon detectors distinguishing the presence and the absence of photons, but does not make use of photon counters. We identify fixed points of the iteration map, and discuss in detail its convergence properties. Necessary and sufficient criteria for the convergence to two-mode Gaussian states are presented. On the basis of various examples we discuss the performance of the procedure as far as the increase of the degree of entanglement and two-mode squeezing is concerned. Finally, we consider imperfect operations and outline the robustness of the scheme under non-unit detection efficiencies of the detectors. This analysis implies that the proposed protocol can be implemented with currently available technology and detector efficiencies.

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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