论文标题
使用Cooper-Pair Box的Josephson电容来增强光学耦合和Kerr非线性
Enhancement of the optomechanical coupling and Kerr nonlinearity using the Josephson Capacitance of Cooper-pair box
论文作者
论文摘要
我们提出了一种方案，以增强微波炉和机械谐振器之间的光力耦合，最多可以在电路光学机械设置中与超筋耦合极限的七个数量级。这里考虑的三方系统由一个约瑟夫森交界库库盒组成，该盒子介导微波炉和机械谐振器之间的耦合。可以通过调整盖特盒的门电荷和磁通量偏置来修改光力耦合，而库珀对盒的磁通量偏置又影响了库珀对盒的约瑟夫森电容。我们还表明，通过合适的调谐参数选择，光力耦合消失，系统在腔和机械谐振器之间纯粹表现出纯粹的非线性类型。这允许系统用于声子计数。
We propose a scheme for enhancing the optomechanical coupling between microwave and mechanical resonators by up to seven orders of magnitude to the ultrastrong coupling limit in a circuit optomechanical setting. The tripartite system considered here consists of a Josephson junction Cooper-pair box that mediates the coupling between the microwave cavity and the mechanical resonator. The optomechanical coupling can be modified by tuning the gate charge and the magnetic flux bias of the Cooper-pair box which in turn affect the Josephson capacitance of the Cooper-pair box. We additionally show that with suitable choice of tuning parameters, the optomechanical coupling vanishes and the system exhibits purely a cross-Kerr type of nonlinearity between the cavity and the mechanical resonator. This allows the system to be used for phonon counting.
