Quantum Zeno switch for single-photon coherent transport
Quantum Zeno switch for single-photon coherent transport
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用于单光子相干传输的量子 Zeno 开关
DOI：
10.1103/physreva.80.062109
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发表时间：
2008-12
影响因子：
2.9
通讯作者：
中科院分区：
文献类型：
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作者：
利用动态量子芝诺效应，我们提出了一种控制双能级系统（TLS）与其周围环境之间耦合的一般方法，即用高频信号调制TLS的能级间隔。我们表明，当调制场的振幅和频率之比被调整为贝塞尔函数的零时，tls与周围环境的相互作用可以被关闭。量子芝诺效应也可以通过在这些零点处光子反射的消失来观察到。基于这些结果，我们提出了一种量子开关来控制单光子在一维波导中的输运。本文的分析结果与Floquet理论的数值结果吻合较好。
Using a dynamical quantum Zeno effect, we propose a general approach to control the coupling between a two-level system (TLS) and its surroundings, by modulating the energy-level spacing of the TLS with a high-frequency signal. We show that the TLS-surroundings interaction can be turned off when the ratio between the amplitude and the frequency of the modulating field is adjusted to be a zero of a Bessel function. The quantum Zeno effect of the TLS can also be observed by the vanishing of the photon reflection at these zeros. Based on these results, we propose a quantum switch to control the transport of a single photon in a one-dimensional waveguide. Our analytical results agree well with numerical results using Floquet theory.