Magnetic control of biexcitons in a quantum dot-cavity system

Highlights: • The Voigt configuration maximizes the occupations of the biexciton states. • The presence of anti-crosses in the dispersion relations shows that the system operates in a strong coupling regime. • Biexciton states can be manipulated through an external magnetic field. This paper study the effect of an external magnetic field on the steady-state observables of a multi-excitonic quantum dot embedded in a bimodal optical cavity. In particular, we perform a detailed analysis of the occupations and dispersion relations of the dressed states of the system as a function of both the intensity and tilt angle of the external magnetic field, and it is found that the dispersion relation reveals the presence of anti-crosses as a signature of coupling light-matter in the quantum system. Additionally, we demonstrate that by varying in the tilt angle and intensity of the applied magnetic field, the steady-state occupations can be manipulated to achieve magnetic control in this solid-state quantum system. We explore an operation regime of the quantum system, where it is possible to find optimal parameters for which the highest biexciton state could lead to the emission of entangled photons.