一种实用的去相干相干态叠加部分零差提纯方案
Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection
摘要：
我们提出了一个简单的协议来净化相干态叠加，经历了线性有损信道。该方案仅由一个分束器和一个零差探测器组成，在实验上是可行的。在实际应用中，相干态的叠加通过线性损耗被转化为相干态的经典混合，这通常是光学系统中的主要退相干机制。我们还讨论了从退相干态产生更大振幅叠加态的可能性，并表明在大多数情况下，态的退相干随着振幅的增加而放大。
英文摘要：
We present a simple protocol to purify a coherent-state superposition that has undergone a linear lossy channel. The scheme constitutes only a single beam splitter and a homodyne detector, and thus is experimentally feasible. In practice, a superposition of coherent states is transformed into a classical mixture of coherent states by linear loss, which is usually the dominant decoherence mechanism in optical systems. We also address the possibility of producing a larger amplitude superposition state from decohered states, and show that in most cases the decoherence of the states are amplified along with the amplitude.
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