基于原子系综集体激发的量子存贮

近几年来，人们从理论和实验两个方面探讨了利用自由原子系综作为量子记忆体的可能性. 基于固定于格点上Λ型“原子”系综的准自旋波激发的研究， 提出了实现光子信息量子存贮的新方案. 这个方案的目标是为了克服自由原子系综量子存贮方案中存在的量子态漏损诱导退相干的致命问题. 研究过程中发现了系综型量子记忆体中隐藏动力学的对称性和其绝热暗态演化的选择定则. 为了确切地表述这个工作的意义，还扼要地介绍这个方案建立的前期关于原子系综对称集体激发的系列工作. In this article we reviews a new protocol of quantum memory based on the quasi pin wave excitation of the Λ systems fixed the sites of lattice. This protocol tries to avoid the disadvantage of the quantum memory scheme based on free atom ensemble， the quantum decoherence induced by the quantum leakage of collective state. Especially，we discover a universal dynamic symmetry hidden in various ensemble based quantum storage scheme. To understand the significance of this work exactly， we also give a brief introduction to our systematical studies on collective symmetric excitons in quantum ensemble，which is the necessary to propose the present scheme for quantum memory.

Quantum Storage Based on Collective Excitations in Atomic Ensemble

In this article we reviews a new protocol of quantum memory based on the quasi pin wave excitation of the Λ systems fixed the sites of lattice. This protocol tries to avoid the disadvantage of the quantum memory scheme based on free atom ensemble， the quantum decoherence induced by the quantum leakage of collective state. Especially，we discover a universal dynamic symmetry hidden in various ensemble based quantum storage scheme. To understand the significance of this work exactly， we also give a brief introduction to our systematical studies on collective symmetric excitons in quantum ensemble，which is the necessary to propose the present scheme for quantum memory.