Detecting Quantum States with a Positive Wigner Function beyond Mixtures of Gaussian States
- 16 May 2011
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 106 (20), 200401
- https://doi.org/10.1103/physrevlett.106.200401
Abstract
We propose a criterion giving a sufficient condition for quantum states of a harmonic oscillator not to be expressible as a convex mixture of Gaussian states. This nontrivial property is inherent to, e.g., a single-photon state and the criterion thus allows one to reveal a signature of the state even in quantum states with a positive Wigner function. The criterion relies on directly measurable photon number probabilities and enables detection of this manifestation of a single-photon state in quantum states produced by solid-state single-photon sources in a weak coupling regime. DOI: http://dx.doi.org/10.1103/PhysRevLett.106.200401 © 2011 American Physical SocietyKeywords
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