Coherent collisional decoherence
arxiv(2024)
摘要
We study the decoherence of a system of N non-interacting heavy particles
(atoms) due to coherent scattering with a background gas. We introduce a new
framework for computing the induced phase shift and loss of contrast for
arbitrary preparations of N-particle quantum states. We find new phase shifts
that are inherently (N≥ 2)-body effects and may be searched for in future
experiments. We analyze simple setups, including a two-mode approximation of an
interferometer. We study fully entangled N00N states, which resemble the
correlated positions in a matter interferometer, as well as totally
uncorrelated product states that are representative of a typical state in an
atom interferometer. We find that the extent to which coherent enhancements
increase the rate of decoherence depends on the observable of interest, state
preparation, and details of the experimental design.
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