Quadrature coherence scale driven fast decoherence of bosonic quantum field states
arXiv:1909.05025 · doi:10.1103/PhysRevLett.124.090402
Abstract
We introduce, for each state of a bosonic quantum field, its quadrature coherence scale (QCS), a measure of the range of its quadrature coherences. Under coupling to a thermal bath, the purity and QCS are shown to decrease on a time scale inversely proportional to the QCS squared. The states most fragile to decoherence are therefore those with quadrature coherences far from the diagonal. We further show a large QCS is difficult to measure since it induces small scale variations in the state's Wigner function. These two observations imply a large QCS constitutes a mark of "macroscopic coherence". Finally, we link the QCS to optical classicality: optical classical states have a small QCS and a large QCS implies strong optical nonclassicality.
arXiv comment12 pages, 5 figures. New version to match the published version. Minor errors were corrected
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