Nanolaser in the self-generated nonequilibrium environment: Quantum fluctuations and entanglement

We investigate the dynamics of the spaser-based nanolaser in the strong incoherent pumping regime in the quantum limit when the photon number is the order of unity. We consider the situation where the newly irradiated photon finds itself in the cloud of earlier irradiated photons that are not thermalized. As the result the entanglement of nanoparticle with quantum dot degrees of freedom in the nanolaser and the lasing intensity increases several times. In fact, the nonthermal bath effectively makes the nanolaser “more quantum” and the master equation for the nanolaser density matrix nonlinear and self-consistent.