用于光学零差的快速纯化方案
Rapid-purification protocols for optical homodyning
摘要：
我们提出了一些快速净化反馈协议的光学零差检测的一个单一的光学量子比特。我们首先推导出一个协议，加快了系统的平均纯度的增加率，并发现，像一个非耗散测量的等效协议，这产生了一个确定性的演化的纯度在强反馈的限制。我们还考虑了两个类似的怀斯曼-拉尔夫快速纯化协议在这种情况下，并表明，像该协议，他们加快了平均时间达到一个固定的纯度水平。我们还研究了这些算法的性能如何随着检测效率而变化，这是一个重要的实际考虑因素。
英文摘要：
We present a number of rapid-purification feedback protocols for optical homodyne detection of a single optical qubit. We derive first a protocol that speeds up the rate of increase of the average purity of the system, and find that like the equivalent protocol for a non-disspative measurement, this generates a deterministic evolution for the purity in the limit of strong feedback. We also consider two analogues of the Wiseman-Ralph rapid-purification protocol in this setting, and show that like that protocol they speed up the average time taken to reach a fixed level of purity. We also examine how the performance of these algorithms changes with detection efficiency, being an important practical consideration.
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