title: Reducing multi-photon rates in pulsed down-conversion by temporal multiplexing.
abstract: We present a simple technique to reduce the emission rate of higher-order photon events from pulsed spontaneous parametric down-conversion. The technique uses extra-cavity control over a mode locked ultrafast laser to simultaneously increase repetition rate and reduce the energy of each pulse from the pump beam. We apply our scheme to a photonic quantum gate, showing improvements in the non-classical interference visibility for 2-photon and 4-photon experiments, and in the quantum-gate fidelity and entangled state production in the 2-photon case.
authors: ARC Centre for Engineered Quantum Systems, ARC Centre for Quantum Computer and Communication Technology, School of Mathematics and Physics, University of Queensland, 4072 Brisbane, QLD, Australia. m.a.broome@googlemail.com
authors: M A
authors: MA
authors: Broome
authors: M P
authors: MP
authors: Almeida
authors: A
authors: A
authors: Fedrizzi
authors: A G
authors: AG
authors: White