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IEEE Transactions on Instrumentation and Measurement

Absolute Quantum Efficiency Measurements by Means of Conditioned Polarization Rotation

G. Brida, Maria V. Chekhova, Marco Genovese, Marco Gramegna, Leonid A. Krivitsky, Maria Luisa Rastello

Published Mar 21, 2005• 7 citations
Publisher

Abstract

We propose a new scheme for measuring the quantum efficiency of photon counting detectors by using correlated photons. The measurement technique is based on a 90/spl deg/ rotation of the polarization of one photon member of a correlated pair produced by parametric down-conversion, conditioned on the detection of the other correlated photon after polarization selection. We present experimental results obtained with this scheme.

DOI
10.1109/tim.2005.843570

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We propose a new scheme for measuring the quantum efficiency of photon counting detectors by using correlated photons. The measurement technique is based on a 90/spl deg/ rotation of the polarization of one photon member of a correlated pair produced by parametric down-conversion, conditioned on the detection of the other correlated photon after polarization selection. We present experimental results obtained with this scheme.
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Our last experimental results on the realization of a measurement-conditional unitary operation at single photon level are presented. This gate operates by rotating by 90o90^o90o the polarization of a photon produced by means of Type-II Parametric Down Conversion conditional to a polarization measurement on the correlated photon. We then propose a new scheme for measuring the quantum efficiency of a single photon detection apparatus by using this set-up. We present experimental results obtained with this scheme compared with {\\it traditional} biphoton calibration. Our results show the interesting potentiality of the suggested scheme.
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