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Experimental quantum tomography of a homodyne detector

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arxiv 1505.03297 v2 pith:5X2XQ3HD submitted 2015-05-13 quant-ph

classification quant-ph
keywords detectorquantumhomodynemeasureoperatorstatesalgorithmassociated
verification ladder T0 review T1 audit T2 compute T3 formal

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We suggest and demonstrate a tomographic method to fully characterize homodyne detectors at the quantum level. The operator measure associated with the detector is expanded in the quadrature basis and probed with a set of coherent states. The coefficients of the expansion are retrieved using a least squares algorithm. We then validate the reconstructed operator measure on nonclassical states. Finally, we exploit results to estimate the overall quantum efficiency of the detector.

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