Physics – Quantum Physics
Scientific paper
2004-09-09
Physics
Quantum Physics
to appear in Proc. of SPIE meeting, Denver august 2004
Scientific paper
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 $90^o$ 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.
Brida Giorgio
Chekhova Maria
Genovese Marco
Gramegna Marco
Krivitsky Leonid
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