利用反馈控制电路QED实现纳米谐振器Fock态的连续量子非破坏测量
Continuous quantum non-demolition measurement of Fock states of a nanoresonator using feedback-controlled circuit QED
摘要：
提出了一种通过反馈控制耦合电路QED系统实现纳米机械谐振腔Fock态量子非破坏（QND）测量的方案。库珀对盒（CPB）耦合到纳米谐振器和微波腔两者。CPB通过腔上的零差检测读出，并且反馈控制用于实现CPB的非耗散测量。这实现了间接QND测量的纳米谐振器通过二阶耦合的CPB的纳米谐振器数运算符。可以通过对导出的随机主方程进行积分或者通过对测量信号进行处理来确定福克态的声子数。
英文摘要：
We propose a scheme for the quantum non-demolition (QND) measurement of Fock states of a nanomechanical resonator via feedback control of a coupled circuit QED system. A Cooper pair box (CPB) is coupled to both the nanoresonator and microwave cavity. The CPB is read-out via homodyne detection on the cavity and feedback control is used to effect a non-dissipative measurement of the CPB. This realizes an indirect QND measurement of the nanoresonator via a second-order coupling of the CPB to the nanoresonator number operator. The phonon number of the Fock state may be determined by integrating the stochastic master equation derived, or by processing of the measurement signal.
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