Light transmission from a strongly coupled QD-Cavity system driven by a laser pulse

Abstract

Abstract Cavity transmission and second-order coherence function of a quantum dot-cavity system strongly coupled and driven by a laser pulse were studied theoretically. The calculations were carried out by solving the master equation in the Lindblad form. A quantum dot (QD) modeled as a two-level system is assumed to interact with a single-mode quantized electromagnetic field following the Jaynes-Cummings model. Furthermore, a classic pulse with a time-varying profile is considered to interact with the cavity mode. Lindbladian includes spontaneous emission losses, cavity decay and, pure QD dephasing. Cavity transmission and second-order coherence were studied as functions of time considering various pulse shapes and different values of full width at half maximum (FWHM), pulse intensity, and pure QD dephasing. We found that the cavity transmission shows an oscillatory behavior, which is a sign of strong coupling in the system. The pulses considered have similar effects on the cavity transmission. According to the values obtained for the second-order coherence function, the QD-cavity system strongly coupled and excited with classical light works as a quantum light source that exhibits sub-Poissonian statistics and photon bunching phenomenon for all pulses.