SLOW LIGHT AND QUANTUM STORAGE IN ELECTROMAGNETICALLY INDUCED TRANSPARENCY MEDIA

Abstract

In this paper, we study the process of slow light propagation and quantum state storage in a lambda configuration three-level atomic environment through dark state polarization based on the electromagnetic induction transparency effect (EIT). By combining fourth-order Runge-Kutta and finite difference methods, we numerically solve the system of Heisenberg-Langevin equations for the evolution of the probe field in an atomic medium. The results show that the normal dispersion domain with large dispersion and suppressed absorption is controlled by changing the intensity of the control field. Thus, it is possible to obtain light propagating at an extremely slow group velocity in the EIT window. In particular, probe laser pulses are stored and recovered under dark-state polarization through controlled laser field modulation. These results are very useful for research on optical quantum memory, which has applications in quantum information devices and quantum computers.