Atom-field correlations in the weak-excitation limit of absorptive optical bistability
Th. K. Mavrogordatos
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden
Abstract
We calculate the steady-state and first-order time varying atom-field
correlation functions in the weak-excitation limit of absorptive optical
bistability from a linearized theory of quantum fluctuations. We formulate a
Fokker-Planck equation in the positive P representation following the phase-space
analysis of [H. J. Carmichael, Phys. Rev. A 33, 3262 (1986)] which
is suitable for the determination of cross-correlations as it does not resort to
adiabatic elimination. Special emphasis is placed on the limit of collective
strong coupling as attained from a vanishing photon-loss rate. We compare to the
cavity-transmission spectrum with reference to experimental results obtained for
macroscopic dissipative systems, discussing the role of anomalous correlations
arising as distinct nonclassical features.