量子系统中纯态和混合态量子芝诺效应研究

Study on Quantum Zeno Effect with Pure States and Mixed States in Quantum Systems

当不稳定量子系统被频繁地测量时,此系统的状态保持不变,量子芝诺效应就会发生.现实存在的量子系统由于与环境相耦合而不可避免地处于混合态.然而,人们对量子芝诺效应的研究基本上只针对纯态量子系统.故研究量子系统中混合态量子芝诺效应将更加具有实际意义.可以证明,量子系统中纯态和混合态均存在量子芝诺效应.

When unstable quantum systems are frequently measured,the initial states of the systems will re-main unchanged,and quantum Zeno effect will occur. Due to the interaction with its surrounding environ-ment,the realistic quantum systems are all in mixed state inevitably. Most of the studies on quantum Zeno ef-fect only focused on quantum systems with pure initial states. Therefore,the investigations on quantum Zeno effect with mixed initial states in unstable quantum systems are more desirable and of practical significance. We can prove the existence of quantum Zeno effect with pure states and mixed states in quantum systems.