Possibility of absolute calibration of analog detectors by using parametric downconversion: a systematic study
Giorgio Brida,
Marco Genovese,
Ivano Ruo-Berchera,
Maria Chekhova,
Alexander Penin
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
23
(10)
2185-2193
(2006)
| Journal
Prompted by the need for various studies ranging from quantum information to foundations of quantum mechanics, we systematically study the possibility of the absolute calibration of analog photodetectors based on the properties of parametric amplifiers. Our results show that such a method can be effectively developed with interesting possible applications in metrology. (c) 2006 Optical Society of America.
Multiphoton correlations in parametric down-conversion and their measurement in the pulsed regime
O. A. Ivanova,
T. Sh. Iskhakov,
A. N. Penin,
M. V. Chekhova
We consider normalised intensity correlation functions (CFs) of different orders for light emitted via parametric down-conversion (PDC) and their dependence on the number of photons per mode. The main problem in measuring such correlation functions is their extremely small width, which considerably reduces their contrast. It is shown that if the radiation under study is modulated by a periodic sequence of pulses that are short compared to the CF width, no decrease in the contrast occurs. A procedure is proposed for measuring normalised CFs of various orders in the pulsed regime. For nanosecond-pulsed PDC radiation, normalised second-order CF is measured experimentally as a function of the mean photon number.
Dispersion spreading of biphotons in optical fibers and two-photon interference
G Brida,
MV Chekhova,
M Genovese,
M Gramegna,
LA Krivitsky
We present the first observation of two-photon polarization interference structure in the second-order Glauber correlation function of two-photon light generated via type-II spontaneous parametric down-conversion. In order to obtain this result, two-photon light is transmitted through an optical fiber and the coincidence distribution is analyzed by means of the start-stop method. Beyond the experimental demonstration of an interesting effect in quantum optics, these results also have considerable relevance for quantum communications.
Kontakt
Forschungsgruppe Maria Chekhova
Max-Planck-Institut für die Physik des Lichts Staudtstr. 2 91058 Erlangen
