论文标题
通过连续测量和反馈控制增强量子同步
Enhancement of quantum synchronization via continuous measurement and feedback control
论文作者
论文摘要
我们研究了量子驱动器与谐波驱动器的量子范围振荡器的同步，并证明可以通过在与振荡器线性耦合并在振荡器上应用反馈控制的其他浴缸上进行连续的同伴测量，从而增强了量子同步。通过连续测量减少量子波动来提高振荡器的相位相干性，而测量背部不可避免地会在相锁定点周围诱导波动。我们提出了一种简单的反馈策略，用于通过调整谐波驱动器的频率来抑制测量引起的波动，从而增强量子同步。我们进一步证明，通过对振荡器相位扩散的正交角进行量子测量，可以实现量子同步的最大增强，并提取振荡器相的最大信息。
We study synchronization of a quantum van der Pol oscillator with a harmonic drive and demonstrate that quantum synchronization can be enhanced by performing continuous homodyne measurement on an additional bath linearly coupled to the oscillator and applying feedback control to the oscillator. The phase coherence of the oscillator is increased by reducing quantum fluctuations via the continuous measurement, whereas the measurement backaction inevitably induces fluctuations around the phase-locking point. We propose a simple feedback policy for suppressing measurement-induced fluctuations by adjusting the frequency of the harmonic drive, which results in enhancement of quantum synchronization. We further demonstrate that the maximum enhancement of quantum synchronization is achieved by performing quantum measurement on the quadrature angle at which the phase diffusion of the oscillator is the largest and the maximal information of the oscillator phase is extracted.
