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首页> 外文期刊>Physical Review, A >Weak stochastic ratchets and dynamic localization in measurement-induced quantum trajectories
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Weak stochastic ratchets and dynamic localization in measurement-induced quantum trajectories

机译:测量诱导量子轨迹中的随机棘轮弱和动态定位

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摘要

We consider a qubit governed by a sequence of weak measurements, with the measurement strength modified in a time- and state-dependent manner. Here we show that the resulting trajectory of the qubit in the phase space can be weakly controlled without any direct action on the qubit (control-free control), even if only one fixed observable is measured. In particular, we demonstrate a possibility of a weak form of a stochastic ratchet, allowing us to weakly push the qubit’s state without any net force in the effective potential. Furthermore, if the weak measurement strength is significantly reduced in a way conditioned to some particular state, a dynamical localization near this state takes place. If the measurement strength is reduced to zero, a singularity appears, which behaves like an artificial basis state.
机译:我们考虑一系列弱测量序列管辖的Qubit,测量强度以时间和状态依赖性的方式修改。 在这里,我们表明,即使在测量一个固定的可观察到,也可以弱控制相位空间中的Qubit的结果的轨迹。 特别是,我们展示了随机棘轮的弱形式的可能性,允许我们在有效潜力中没有任何净力的诸如净力的Qubit的状态。 此外,如果以条件到某种特定状态的方式显着降低弱测量强度,则发生该状态的动态定位。 如果测量强度降至零,则出现奇点,这表现类似于人工基状态。

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