A scheme for two-photon lasing with two coupled flux qubits in circuit quantum electrodynamics

Abstract

We theoretically study the system of a superconducting transmission line resonator coupled to two interacting superconducting flux qubits. It is shown that under certain conditions the resonator mode can be tuned to two-photon resonance between the ground state and the highest excited state while the middle excited states are far-off resonance. Furthermore, we study the steady-state properties of the flux qubits and resonator, such as the photon statistics, the spectrum and squeezing of the resonator, and demonstrate that two-photon laser can be implemented with current experimental technology.

Correlated spectrum of distant semiconductor qubits coupled by microwave photons

“…Furthermore, we find a one-to-one correspondence between these geometric features and the system parameters. Simulation using the Tavis-Cummings (TC) model [50,51] produces excellent agreement with our experimental findings. These results demonstrate that we can characterize properties of a circuit QED coupled hybrid system without sweeping the frequency of the applied microwave.…”

Photon bunching and anti-bunching with two dipole-coupled atoms in an optical cavity

“…[20,23,24] In a cavity QED system, the nonclassical photon statistics of light can be controlled via the photon blockade and electromagnetically induced transparency with emitters strongly coupled to an optical resonator. [25][26][27][28][29][30][31][32][33] Here, we will discuss the similar physics in a different way that involves the interatomic interaction. We consider two dipole-coupled atoms trapped in an optical cavity driven by an external laser field and take the cooperative emission into account.…”