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  • 1.
    Sauge, Sebastien
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Swillo, Marcin
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Albert-Seifried, Sebastian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Waldebäck, Johan
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tengner, Maria
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ljunggren, Daniel
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Karlsson, Anders
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Xavier, G. B.
    Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks2007In: CLEO/Europe IQEC 2007: 17-22 June 2007, Munich, Germany, 2007, p. 4387014-Conference paper (Refereed)
  • 2.
    Sauge, Sebastien
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Swillo, Marcin
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Albert-Seifried, Sebastian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Xavier, Guilherme
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Waldebäck, Johan
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tengner, Maria
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ljunggren, Daniel
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Karlsson, Anders
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks2007In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, no 11, p. 6926-6933Article in journal (Refereed)
    Abstract [en]

    We present a bright, narrowband, portable, quasi-phase- matched two-crystal source generating polarization- entangled photon pairs at 809 nm and 1555 nm at a maximum rate of 1.2 x 10(6) s(-1) THz(-1) mW(-1) after coupling to single- mode fiber. The quantum channel at 1555 nm and the synchronization signal gating the single photon detector are multiplexed in the same optical fiber of length 27 km by means of wavelength division multiplexers (WDM) having 100 GHz (0.8 nm) spacing between channels. This implementation makes quantum communication applications compatible with current high-speed optical networks.

  • 3.
    Sauge, Sebastien
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Swillo, Marcin
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Albert-Seifried, Sebastian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Xavier, Guilherme
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Waldebäck, Johan
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tengner, Maria
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ljunggren, Daniel
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wang, Qin
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Karlsson, Anders
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Quantum communication in optical networks: an overview and selected recent results2007In: ICTON 2007: Proceedings of the 9th International Conference on Transparent Optical Networks, Vol 1 / [ed] Marciniak, M, 2007, p. 30-33Conference paper (Refereed)
    Abstract [en]

    We discuss recent work in quantum communication, and in some details present a bright, narrowband, portable, quasi-phase-matched two-crystal source generating polarization-entangled photon pairs at 809 nm and 1555 nm. We also show how the single-photon quantum channel at 1555 nm and a classical synchronization signal gating the single photon detector at the receiving side can be multiplexed in the same optical fiber of length 27 km by means of wavelength division multiplexers (WDM) having 100 GHz (0.8 nm) spacing between channels. This illustrates bow single-photon quantum communication applications is compatible with current high-speed optical networks.

  • 4.
    Tengner, Maria
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Ljunggren, Daniel
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Sauge, Sebastien
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Waldeback, Johan
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Karlsson, Anders
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Single-photon correlations for secure communication2006In: Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components Architectures for Microwave Systems and Displays / [ed] Sjoqvist, LJ; Wilson, RA; Merlet, TJ, BELLINGHAM, WA: SPIE-INT SOC OPTICAL ENGINEERING , 2006, Vol. 6399, p. U124-U132Conference paper (Refereed)
    Abstract [en]

    We present two types of photon sources designed for secure quantum communication, e.g. for quantum cryptog raphy. Both types are based on the creation of photon pairs by spontaneous parametric downconversion in nonlinear crystals. The first is a heralded single photon source and the second is a source of polarization-entangled photon pairs. For the heralded single photon source the detection of one of the photons of a downconversion pair is used as a trigger to announce the presence of the other: the single photon. The source is characterized by a highly sub-Poisson photon number statistics making it very suitable for use in quantum cryptography protocols using single photonic qubits to create correlated information between a sender and a receiver. The entanglement source instead uses the inherent non-classical correlations between entangled qubits. We also present a hybrid-encoding where the sender uses polarization to encode information while the receiver uses time-bins. Both sources create photons with highly non-degenerate wavelengths of 810 nm and 1550 nm, taking advantage of the efficient detectors at near-infrared and the low transmission loss of optical fibers at telecommunication wavelengths.

1 - 4 of 4
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