School of Physics - Research Publications

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Subject: Optics and Opto-electronic Physics ; Physical Sciences × Author: Castelletto, Stefania ×

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    Tailoring single-photon and multiphoton probabilities of a single-photon on-demand source
    Migdall, AL ; Branning, D ; Castelletto, S (AMER PHYSICAL SOC, 2002-11)
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    Spatial and spectral mode selection of heralded single photons from pulsed parametric down-donversion
    Castelletto, S ; Degiovanni, IP ; Schettini, V (OPTICAL SOC AMER, 2005-09-05)
    We describe an experiment in which photon pairs from a pulsed parametric down-conversion (PDC) source were coupled into single-mode fibers with heralding efficiencies as high as 70%. Heralding efficiency or mode preparation efficiency is defined as the probability of finding a photon in a fiber in a definite state, given the detection of its twin. Heralding efficiencies were obtained for a range of down-conversion beam-size configurations. Analysis of spatial and spectral mode selection, and their mutual correlation, provides a practical guide for engineering PDC-produced single photons in a definite mode and spectral emission band. The spectrum of the heralded photons were measured for each beam configuration, to determine the interplay between transverse momentum and spectral entanglement on the preparation efficiency.
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    Quantum dense key distribution
    Degiovanni, IP ; Berchera, IR ; Castelletto, S ; Rastello, ML ; Bovino, FA ; Colla, AM ; Castagnoli, G (AMER PHYSICAL SOC, 2004-03)
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    Experimental evidence for bounds on quantum correlations
    Bovino, FA ; Castagnoli, G ; Degiovanni, IP ; Castelletto, S (AMER PHYSICAL SOC, 2004-02-13)
    We implemented the experiment proposed by Cabello in the preceding Letter to test the bounds of quantum correlation. As expected from the theory we found that, for certain choices of local observables, Tsirelson's bound of the Clauser-Horne-Shimony-Holt inequality (2 x square root of 2) is not reached by any quantum states.