Experimental quantum tomography of a homodyne detector

Abstract

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.

6 pages, 4 figures. Comments are welcome

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• Quasiprobability distributions for quantum-optical coherence and beyond
• Enhancing quantum entropy in vacuum-based quantum random number generator
• Two-stage Estimation for Quantum Detector Tomography: Error Analysis, Numerical and Experimental Results
• Quantum description of timing-jitter for single photon ON/OFF detectors
• Compressively certifying quantum measurements
• Homodyning the $g^{(2)}(0)$ of Gaussian states