A quantum description of the beam splitter |
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| Affiliation: | 2. Department of Physics, University of Colorado, Boulder, CO, United States;3. Department of Physics and Astronomy, University of Aarhus, Aarhus, Denmark;4. Department of Physics, Imperial College, London, United Kingdom |
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| Abstract: | We derive the unitary transformation that embodies the action of a lossless plane-parallel beam splitter on an incident light beam. We use the transformation to illustrate with some examples how fluctuations and noise in one light mode may get coupled with those in another mode. |
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