Field squeezing in a tunneling-coupled quantum dot molecule and field interaction system

Abstract

An analysis of the field squeezing is presented for the system of a tunneling-coupled quantum dot molecules interacting with a single-mode quantum light field. The time evolution of squeezing parameters is obtained by solving the Liouville-von Neumman-Lindblad equation in Markovian approximation, which considers the spontaneous exciton decay and pure dephasing. Under the initial coherent optical field, We find field squeezing both in short time regime and during the population oscillation revivals. And we also find that the squeezing during the population oscillation revivals can be enhanced by the decrease of the dissipation parameters Γ01,Γ1,Γ2 associated with spontaneous emission and dephasing and by the increase of the initial mean photon number, tunneling coefficient and the nonradiative dissipation parameter Γ02 or when the detuning of the laser is approximately equal to the energy difference between the electron tunneling coupled states, while there is little change in squeezing for variation of the above-mentioned parameters in the short time regime.