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Intensity correlations from linear interactions

100%

Bina M., Olivares S.

Quantum Measurements and Quantum Metrology

2014

vol. 2

issue 1

We address the generation of intensity correlations arising from the interference between two optical states interacting through a beam splitter. We consider both phase insensitive and sensitive states and write the intensity correlations as functions of the mean number of photons and field quadratures of the input states. In particular we consider Fock number states and squeezed states as a paradigm of non-classical states and mixture of coherent states, which can be experimentally accessible. We show that, under certain conditions on the input states, intensity correlations may vanish or turn into anticorrelations.

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

81%

Olivares S., Allevi A., Bondani M.

Quantum Measurements and Quantum Metrology

2014

vol. 2

issue 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.

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2 Quantum Measurements and Quantum Metrology

2 2014

2 Olivares S.

1 Allevi A.

1 Bina M.

1 Bondani M.

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Intensity correlations from linear interactions

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