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三能级原子系统中量子态相干保持的控制策略 被引量:1

Coherence-preserving control strategy in three-level atom system
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摘要 研究光与物质的相互作用并利用其性质设计新型的量子器件,以实现光信息存储及其消相干抑制.分析了以单色激光场为控制场的Λ型三能级原子系统的主方程模型,借助于无消相干子空间的构造方法,通过改变耦合激光场Rabi频率的方式,设计了实现系统中量子态相干保持的控制策略. The interpretation to the mechanism of interaction of light and matter is used in new quantum devices designing for the optical information storage. For reducing the unexpected decoherence effect in a A-typed three-level atom system, the master equation of an atomic system is investigated to find a set of states that have zero spontaneous decay rates. Two laser fields are introduced to prepare the decoherence-free state by using decoherence-free subspace (DFS) strategy to suppress spontaneous emission for the decoupling of the system's state and the environment. Theoretical analysis verifys its effectiveness to coherence-preserving.
作者 李明 陈宗海
出处 《控制与决策》 EI CSCD 北大核心 2009年第3期451-454,共4页 Control and Decision
基金 国家自然科学基金项目(60804020) 中国科学技术大学研究生创新基金项目(KD2006040)
关键词 三能级原子系统 量子调控 相干保持 相干控制 无消相干子空间 Three-level atom system, Manipulation of quantum system Coherence-preserving Coherent control Decoherence-free subspace
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