具备有效存储和读取光的相干态的能力是实现连续变量量子信息存储的关键。本文研究了利用混合光子回声技术对光场的相干态进行存储和读取。光量子态被记录在原子系综的基态的两个相干能级中从而实现长时间的量子态存储。考虑到由于原子退相干的噪声效应, 我们发现在目前可实现的技术条件下存储保真度仍然高于保真度阈值2/3。我们的研究为实现高效准确的基于量子回声技术的光量子态存储提供了一些切实可行的实践指导。

The ability to realize storage and readout of optical coherent state plays a key role in continuous variable quantum information processing. We studied the quantum memory process for optical coherent state based on hybrid photon echo rephrasing technics. Optical state was transformed onto two atomic sub-levels to realize long time quantum memory. Taking into account the effect of decoherence,we found the storage fidelity still surpasses the classical fidelity threshold 2/3 under current available experimental technics. Our work provides some practical guidance for the realization of efficient and faithful photon-echo-based memory for coherent light.