论文标题
按任意顺序进行光子数量测量的量子绝热消除
Quantum adiabatic elimination at arbitrary order for photon number measurement
论文作者
论文摘要
绝热消除是一种基于时间尺度分离的扰动模型还原技术，通常用于简化复合量子系统的描述。我们在这里分析了一个量子实验，其中可以将扰动扩张进行任意秩序，以便：（i）我们可以以量子形式的确切降低模型来制定； （ii）由于该系列为较大的参数值提供了准确性，因此我们可以在时间尺度分离上丢弃任何条件，从而分析实际实验表现最佳的中间方案； （iii）我们可以阐明某些量规自由度在此模型还原技术中的作用。
Adiabatic elimination is a perturbative model reduction technique based on timescale separation and often used to simplify the description of composite quantum systems. We here analyze a quantum experiment where the perturbative expansion can be carried out to arbitrary order, such that: (i) we can formulate in the end an exact reduced model in quantum form; (ii) as the series provides accuracy for ever larger parameter values, we can discard any condition on the timescale separation, thereby analyzing the intermediate regime where the actual experiment is performing best; (iii) we can clarify the role of some gauge degrees of freedom in this model reduction technique.
