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International Conference on Quantum Information

Quantum communication with photon number resolved detection and waveguided parametric downconversion

Christine Silberhorn, Wolfgang Mauerer, Malte Avenhaus, A. Eckstein, Patrick Bronner, Hendrik B. Coldenstrodt-Ronge, Ian A. Walmsley

Published Jan 1, 2007• 0 citations
Publisher

Abstract

We investigate the photon number statistics of a wave-guided parametric down-conversion source with a fiber based, time multiplexed detector. Our setup is particularly suited for a quantum key distribution scheme with passive decoy state preparation.
DOI
10.1364/icqi.2007.ithh2

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Parametric downconversion inaquasi-phase matched KTPwaveguide offers thepossibility toimplement ahighly efficient source ofphotonic states. Weinvestigate thephoton statistics ofsuch asource with atime-multiplexed detector, which iscapable ofphoton number resolution. Parametric downconversion (PDC)sources havebecomeanestablished technique togenerate single photon states. InthePDCprocess pairs ofphotons canbeproduced indistinguishable modes(oforthogonal polarization) suchthat thedetection ofonephoton will herald thepresence oftheother intheconjugate mode.There have always beentwoproblems hindering progress inpreparing higher order photon number states: thelack ofhighly efficient PDCsources andphoton-number resolving detectors. Wedemonstrate approaches tostudy these problems, andshowtheexperimental generation oftwo-photon states withhighfidelity byconditional state preparation. Weutilize atime-multiplexed detector, whichisfiber based andoperates ontheprinciple ofdetector cascading, inconjunction with abright highly efficient waveguided, typeIIPDCsource, which wepumpwithultrashort pulses. ThePDCstate canbedescribed by 00
We propose an efficient quantum key distribution protocol based on the photon-pair generation from parametric down-conversion (PDC). It uses the same experimental setup as the conventional protocol, but a refined data analysis enables detection of photon-number splitting attacks by utilizing information from a built-in decoy state. Assuming the use of practical detectors, we analyze the unconditional security of the new scheme and show that it improves the secure key generation rate by several orders of magnitude at long distances, using a high intensity PDC source.