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1 Quantum Measurements and Quantum Metrology

1 2014

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Gaussian and Non-Gaussian operations on non-Gaussian state: engineering non-Gaussianity

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Olivares S. , Allevi A. , Bondani M.

Quantum Measurements and Quantum Metrology

2014

tom 2

nr 1

Multiple photon subtraction applied to a displaced phase-averaged coherent state, which is a non-Gaussian classical state, produces conditional states with a non trivial (positive) Glauber-Sudarshan Prepresentation. We theoretically and experimentally demonstrate that, despite its simplicity, this class of conditional states cannot be fully characterized by direct detection of photon numbers. In particular, the non-Gaussianity of the state is a characteristics that must be assessed by phase-sensitive measurements. We also show that the non-Gaussianity of conditional states can be manipulated by choosing suitable conditioning values and composition of phase-averaged states.