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Unbalanced Homodyne Correlation Measurements

A method is introduced which allows to measure normal-ordered moments of the displaced photon-number operator up to high orders. It is based on unbalanced homodyne correlation measurements, the local oscillator being replaced by a displaced dephased laser. The measured moments yield a simple approximation of the full quantum state, which is obtained without the need of photon-number resolution. Quantum properties of light are efficiently certified through the direct detection of normal-ordered observables, which is illustrated for a weakly squeezed vacuum and a single-photon-added thermal state.

preprint2016arXivOpen access
B. KühnW. Vogel
quant-ph
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Open access2 authors1 topic
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B. KühnW. Vogel

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