title: Ultrafast time-division demultiplexing of polarization-entangled photons.
abstract: Maximizing the information transmission rate through quantum channels is essential for practical implementation of quantum communication. Time-division multiplexing is an approach for which the ultimate rate requires the ability to manipulate and detect single photons on ultrafast time scales while preserving their quantum correlations. Here we demonstrate the demultiplexing of a train of pulsed single photons using time-to-frequency conversion while preserving their polarization entanglement with a partner photon. Our technique converts a pulse train with 2.69 ps spacing to a frequency comb with 307 GHz spacing which may be resolved using diffraction techniques. Our work enables ultrafast multiplexing of quantum information with commercially available single-photon detectors.
authors.affiliation: Institute for Quantum Computing and Department of Physics & Astronomy, University of Waterloo, Waterloo, Canada N2L 3G1.
authors.forename: John M
authors.initials: JM
authors.lastname: Donohue
authors.affiliation: Institute for Quantum Computing and Department of Physics & Astronomy, University of Waterloo, Waterloo, Canada N2L 3G1 and Group of Applied Physics, University of Geneva, CH-1211 Genève 4, Switzerland.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Lavoie
authors.affiliation: Institute for Quantum Computing and Department of Physics & Astronomy, University of Waterloo, Waterloo, Canada N2L 3G1.
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Resch