Experimental determination of a nonclassical Glauber-Sudarshan P function

Abstract

A quantum state is nonclassical if its Glauber-Sudarshan P function fails to be interpreted as a probability density. This quantity is often highly singular, so that its reconstruction is a demanding task. Here we present the experimental determination of a well-behaved P function showing negativities for a single-photon-added thermal state. This is a direct visualization of the original definition of nonclassicality. The method can be useful under conditions for which many other signatures of nonclassicality would not persist.

4 pages, 4 figures

References in corpus (4)

• Quantum state reconstruction of the single-photon Fock state
• Experimental nonclassicality of single-photon-added thermal light states
• Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection
• Nonclassical character of statistical mixtures of the single-photon and vacuum optical states

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