Control And Detection Based On Coupled Cavity System

The cavity-cavity and cavity-matter coupling systems are the promised candidates to construct the quantum network,and are of potential applications in the design of quantum devices.Therefore,the studies on optical cavity is nowadays becoming one of hot topics in the field of quantum optics.Based on the cavity-cavity and cavity-matter coupling system,we will discuss the design of quantum device and the performance of detection in this issue.The main research results are listed as follows:1.We theoretically propose a scheme for photonic flash based on a linearly coupled cavity system.Via driving the two side cavities by external fields,forming a cyclic energy-level diagram,and the phase difference between the driving fields acts as a controller of the steady state.In the optical trimer structure,we show that the perfect photonic flash can be realized in the situation of resonant driving.The perfect photonic flash scheme is furthermore generalized to multiple coupled cavity system,where the cavities with odd and even number turn bright and dark alternatively via the phase control.2.We propose a theoretical scheme to detect the emitter-resonator coupling strength in the ultra-strong and deep-strong coupling regime in quantum Rabi model via introducing an auxiliary resonator.We demonstrate the total system as a two-mode Rabi model and obtain the ground state by the transformed rotating wave approximation,which is superior to the usually applied rotating wave approximation.Here,the emitter-resonator coupling strength is detected by monitoring the average excitation number in the auxiliary resonator and the sensitivity of the detection scheme is discussed in an analytical manner.