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Quantum Zeno and anti-Zeno effect of a nanomechanical resonator measured by a point contact

机译:通过点接触测量的纳米机械共振器的量子芝诺和反芝诺效应

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摘要

The occurrence of either the quantum Zeno effect (QZE) or anti-Zeno effect (AZE) resulting from the short-time behavior of the environment-induced decoherence for quantum Brownian motion (QBM) model has been discussed [S. Maniscalco, J. Piilo, and K. A. Suominen, Phys. Rev. Lett. 97, 130402 (2006)]. We discuss here while the shuttering time period (length) of the frequent observations is changed, the system of interest, i.e., a nanomechanical oscillator, will undergo a QZE to AZE crossover. Instead of interacting with an equilibrium bosonic bath in a QBM model, we investigate the occurrence of either QZE or AZE of a nanomechanical oscillator coupled to a nonequilibrium fermionic reservoir [quantum point contact (QPC) detector as a measuring device]. We find that Zeno and anti-Zeno behaviors depend on the values of the system and reservoir parameters such as the oscillator frequency, energy cutoff, bias voltage, and reservoir temperature.
机译:已经讨论了由环境引起的量子布朗运动(QBM)模型的退相干的短时行为导致的量子芝诺效应(QZE)或反Zeno效应(AZE)的发生[S. Maniscalco,J.Piilo和K.A.Suominen,物理学。牧师97,130402(2006)]。我们在这里讨论,当频繁观察的关闭时间段(长度)改变时,感兴趣的系统(即纳米机械振荡器)将经历QZE到AZE的交叉。我们没有研究在QBM模型中与平衡的玻色子浴相互作用,而是研究了与非平衡铁磁储层耦合的纳米机械振荡器的QZE或AZE的发生[量子点接触(QPC)检测器作为测量装置]。我们发现芝诺和反芝诺的行为取决于系统和储层参数的值,例如振荡器频率,能量截止,偏置电压和储层温度。

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