Phase diffusion pattern in quantum nondemolition systems

Details Phase diffusion pattern in quantum nondemolition systems Phase diffusion pattern in quantum nondemolition systems

2007-03-07

arxiv.org/abs/quant-ph/0703055v2

Phys. Rev. A 75, 062106 (2007)

Physics

Quantum Physics

18 pages, REVTeX, 8 figures

Scientific paper

10.1103/PhysRevA.75.062106

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.

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