Open AccessTwin‐photon techniques for photo‐detector calibration
Author(s) -
Brida G.,
Genovese M.,
Gramegna M.
Publication year - 2006
Publication title -
laser physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.59
H-Index - 72
eISSN - 1612-202X
pISSN - 1612-2011
DOI - 10.1002/lapl.200510077
Subject(s) - quantum metrology , detector , quantum entanglement , photon , physics , quantum imaging , spontaneous parametric down conversion , quantum sensor , metrology , quantum , calibration , parametric statistics , quantum information , optics , quantum state , coincidence , quantum mechanics , quantum network , statistics , mathematics , medicine , alternative medicine , pathology
The aim of this review paper is to enlighten some recent progresses in quantum optical metrology in the part of quantum efficiency measurements of photo‐detectors performed with bi‐photon states. The intrinsic correlated nature of entangled photons from Spontaneous Parametric Down Conversion phenomenon has opened wide horizons to a new approach for the absolute measurement of photo‐detector quantum efficiency, outgoing the requirement for conventional standards of optical radiation; in particular the simultaneous feature of the creation of conjugated photons led to a well known technique of coincidence measurement, deeply understood and implemented for standard uses. On the other hand, based on manipulation of entanglement developed for Quantum Information protocols implementations, a new method has been proposed for quantum efficiency measurement, exploiting polarisation entanglement in addition to energymomentum and time ones, that is based on conditioned polarisation state manipulation. In this review, after a general discussion on absolute photodetector calibration, we compare these different methods, in order to give an accurate operational sketch of the absolute quantum efficiency measurement state of the art. (© 2006 by Astro, Ltd. Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)