Extended photon correlation in a negative-temperature medium
Document Type
Article
Publication Date
1-1-2008
Abstract
We show how two-photon correlation of a two-level amplifier in the small signal regime depends on the atomic populations and the propagation length. We predict that inverted population associated with negative temperature gives a very long correlation time even in the presence of decoherence, a useful asset for quantum communication. The correlation vanishes for very dilute atomic gas. Analytical solutions for the field operators obtained by Fourier transform and Laplace transform (with initial condition) of the time variable appear very different but yield identical numerical results except for certain parameters. The physical explanation behind the deviation is given. The presence of thermal photons is found to reduce the correlation time.
Keywords
Resonance fluorescence, Laser-amplifier, Quantum-theory
Divisions
PHYSICS
Publication Title
Physical Review A
Volume
77
Issue
5
Publisher
American Physical Society
Additional Information
Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA