Coherent population trapping in quantized light fieldA. V. Taichenachev, A. M. Tumaikin and V. I. Yudin
Novosibirsk State University - Pirogova 2, Novosibirsk 630090, Russia and Institute of Laser Physics, SB RAS - Lavrentyeva 13/3, Novosibirsk 630090, Russia
received 6 June 2005; accepted in final form 21 September 2005
published online 14 October 2005
A full quantum treatment of coherent population trapping (CPT) is given for a system of resonantly coupled atoms and electromagnetic field. We develop a regular analytical method of the construction of generalized dark states (GDS). It turns out that GDS do exist for all optical transitions , including bright transitions and with F'' a half-integer, for which the CPT effect is absent in a classical field. We propose an idea to use an optically thick medium with a transition with a half-integer as a "quantum filter", which transmits only a quantum light with limited number of photons. Such a quantum filter can be used as a deterministic source of Fock's state of light.
42.50.Gy - Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption.
03.67.-a - Quantum information.
© EDP Sciences 2005