Quantum interferometry for noisy detectors

Details Quantum interferometry for noisy detectors Quantum interferometry for noisy detectors

2011-07-19

arxiv.org/abs/1107.3726v1

Physics

Quantum Physics

4 pages + supplementary information (9 pages), 4 + 2 figures

Scientific paper

The sensitivity in optical interferometry is strongly affected by losses during the signal propagation or at the detection stage. The optimal quantum states of the probing signals in the presence of loss were recently found. However, in many cases of practical interest, their associated accuracy is worse than the one obtainable without employing quantum resources (e.g. entanglement and squeezing) but neglecting the detector's loss. Here we detail an experiment that can reach the latter even in the presence of imperfect detectors: it employs a phase-sensitive amplification of the signals after the phase sensing, before the detection. Since our method uses coherent states as input signals, it is a practical technique that can be used for high-sensitivity interferometry and, in contrast to the optimal strategies, does not require one to have an exact characterization of the loss beforehand.

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