Journal
PHYSICAL REVIEW A
Volume 79, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.062303
Keywords
optical beam splitters; quantum optics
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Funding
- Northern Ireland's Department for Employment and Learning
- Korea Research Foundation
- Korean Government [KRF-2008-313-C00188]
- Ente Cassa di Risparmio di Firenze
- CNR-RSTL, and EPSRC
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A beam splitter is one of the most important devices in an optics laboratory because of its handiness and versatility; equivalent devices are found in various quantum systems to couple two subsystems or to interfere them. While it is normal that two independent input fields are superposed at the beam splitter to give correlated outputs, identical Gaussian states interfere there to produce totally independent output fields. We prove that the Gaussian states with same variances are the only states which bring about factorizable output fields.
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