电路量子电动力学中的无反转激光
Lasing without Inversion in Circuit Quantum Electrodynamics
摘要：
研究了在耗散电磁环境中，耦合到受驱动量子比特的传输线振荡器中光子的产生。先前已经证明，量子比特中的粒子数反转可能导致振荡器的激光态。在这里，我们表明，该电路也可以表现出“无反转激光”的效果。这是可能的，因为与吸收相比，与耗散环境的耦合增强了光子发射，类似于原子系统预测的反冲效应。虽然反冲效应非常微弱，而且到目前为止还难以理解，但这里描述的效应应该可以用现有的电路观察到。分析了对系统参数和环境的要求。
英文摘要：
We study the photon generation in a transmission line oscillator coupled to a driven qubit in the presence of a dissipative electromagnetic environment. It has been demonstrated previously that a population inversion in the qubit may lead to a lasing state of the oscillator. Here we show that the circuit can also exhibit the effect of "lasing without inversion". This is possible since the coupling to the dissipative environment enhances photon emission as compared to absorption, similar to the recoil effect which was predicted for atomic systems. While the recoil effect is very weak, and so far elusive, the effect described here should be observable with present circuits. We analyze the requirements for the system parameters and environment.
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