title: Frequency and bandwidth conversion of single photons in a room-temperature diamond quantum memory.
abstract: The spectral manipulation of photons is essential for linking components in a quantum network. Large frequency shifts are needed for conversion between optical and telecommunication frequencies, while smaller shifts are useful for frequency-multiplexing quantum systems, in the same way that wavelength division multiplexing is used in classical communications. Here we demonstrate frequency and bandwidth conversion of single photons in a room-temperature diamond quantum memory. Heralded 723.5 nm photons, with 4.1 nm bandwidth, are stored as optical phonons in the diamond via a Raman transition. Upon retrieval from the diamond memory, the spectral shape of the photons is determined by a tunable read pulse through the reverse Raman transition. We report central frequency tunability over 4.2 times the input bandwidth, and bandwidth modulation between 0.5 and 1.9 times the input bandwidth. Our results demonstrate the potential for diamond, and Raman memories in general, as an integrated platform for photon storage and spectral conversion.
authors.affiliation: Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: Kent A G
authors.initials: KA
authors.lastname: Fisher
authors.affiliation: National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.
authors.forename: Duncan G
authors.initials: DG
authors.lastname: England
authors.affiliation: Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: Jean-Philippe W
authors.initials: JP
authors.lastname: MacLean
authors.affiliation: National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Bustard
authors.affiliation: Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Resch
authors.affiliation: National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.|Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario, Canada K1N 6N5.
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Sussman