Supergain Atom as an Absorber

Michael Berry

Alan V. Durrant, George William Series

Abstract A quantum absorber theory of optical field quantization is developed, in which only matter is quantized by postulate. The amplitudes of the optical field in an absorbing universe are expressed, by using Maxwell’s source equations, in terms of the atomic source operators of the surrounding absorber atoms treated as a single quantum system. Stationary twolevel absorbing atoms are assumed and only electric dipole fields are considered. The resulting optical field is found to be quantized with a mathematical description identical to that of the conventionally quantized optical field, but the physical interpretation is different.

E. H. Weinberg

Ehsan Amooghorban, Azar Bagherzadeh, Gholamhossein Heidary

Recently, coherent perfect absorbers have received much attention from researchers in the field of classical optics. Such absorbers, known as a time-reversal of lasers, provide perfect absorption of the incident light. Considering the very attractive features of these materials, in this paper, we investigate the quantum optics of these materials. To do this, we consider two coherent perfect absorber structures and assume two identical two-level atoms; one of which is prepared in its ground state and the other in the excited state, are placed on both sides of the coherent perfect absorber slabs. We compute the spontaneous emission rate, Lamb shift, and collective decay of atoms near two slabs, and then investigate the entanglement dynamics of the atomic system using the concurrence. We find that these parameters exhibit a damped oscillatory behavior with increasing the distance between the atoms and the slabs. In contrast to the classical regime, we also observe that these structures are not the perfect absorbers in the quantum regime.

André Xuereb