论文标题
在耦合混合双量子点谐振系统中激光
Lasing in a coupled hybrid double quantum dot-resonator system
论文作者
论文摘要
从理论上讲，我们研究了在电磁谐振器中与电压偏置的杂化杂交双量子点相连的可能性，该杂种双量子点由双量子点隧道组成，该点同时耦合到正常金属和超导铅。使用统一的转换，我们在旋转波近似中得出了一个谐振器双量子点相互作用，这表明该系统中的激光是由状态密度的Andreev能级之间的电子过渡介导的。此外，通过采用马尔可夫主方程，该方程纳入了电子和光子自由度的耗散效应，我们从数值上计算了系统的稳态降低密度矩阵，从中我们确定在各种参数方案中确定谐振器中平均光子数量及其统计数据。我们发现，在某些适当的参数配置下，由于系统中多个Andreev级别之间的电子过渡可能性，可以大大增强激光。
We theoretically investigate the possibility of lasing in an electromagnetic resonator coupled to a voltage-biased hybrid double quantum dot comprised of a double quantum dot tunnel coupled simultaneously to a normal metal and a superconducting lead. Using a unitary transformation, we derive a resonator-double quantum dot interaction Hamiltonian in the rotating-wave approximation which reveals the fact that lasing in this system is mediated by electron transitions between Andreev energy levels in the system's density of states. Moreover, by employing a Markovian master equation incorporating dissipation effects for the electronic and photonic degrees of freedom, we numerically calculate the steady-state reduced density matrix of the system from which we determine the average photon number and its statistics in the resonator in various parameter regimes. We find that at some appropriate parameter configurations, lasing can be considerably enhanced due to the possibility of electron transitions between multiple Andreev levels in the system.
