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Phase-diffusion pattern in quantum-nondemolition systems
, J. Ghosh, R. Ghosh
Published in
Volume: 75
Issue: 6
We quantitatively analyze the dynamics of the quantum phase distribution associated with the reduced density matrix of a system, as the system evolves under the influence of its environment with an energy-preserving quantum nondemolition (QND) type of coupling. We take the system to be either an oscillator (harmonic or anharmonic) or a two-level atom (or equivalently, a spin-1/2 system), and model the environment as a bath of harmonic oscillators, initially in a general squeezed thermal state. The impact of the different environmental parameters is explicitly brought out as the system starts out in various initial states. The results are applicable to a variety of physical systems now studied experimentally with QND measurements. © 2007 The American Physical Society.
About the journal
JournalPhysical Review A - Atomic, Molecular, and Optical Physics