Quantum Storage Based on Collective Excitations in Atomic Ensemble
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Graphical Abstract
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Abstract
In this article we reviews a new protocol of quantum memory based on the quasipin 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.
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