Nonclassical properties of coherent states |
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| Institution: | 1. Consortium for Fundamental Physics, Physics Department, Lancaster University, Lancaster LA1 4YB, UK;2. Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland |
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| Abstract: | It is demonstrated that a weak measurement of the squared quadrature observable may yield negative values for coherent states. This result cannot be reproduced by a classical theory where quadratures are stochastic c-numbers. The nonclassicality of coherent states can be associated with negative values of the Terletsky–Margenau–Hill distribution. |
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