Quantum coherent versus classical coherent light |
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Authors: | Dragoman D. Dragoman M. |
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Affiliation: | (1) Physics Department, University of Bucharest, P.O. Box MG-11, 76900 Bucharest, Romania;(2) National Research and Development Institute in Microtechnologies, P.O. Box 38-160, 72225 Bucharest, Romania |
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Abstract: | The paper shows that the Wigner distribution function of quantum optical coherent states, or of a superposition of such states, can be produced and measured with a classical optical set-up using classical coherent light fields. This measurement cannot be done directly in quantum optics since the quantum phase space variables correspond to non-commuting operators. As an example, the Wigner distribution function of Schrödinger cat states of light has been measured. It is also shown that the possibility of measuring the Wigner distribution function of quantum coherent states with classical coherent fields is unique in the sense that it cannot be extended to other quantum states, not even to the incoherent limit of the superposition of coherent states. |
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Keywords: | coherence quantum optics classical optics |
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