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    Alignment system for freespace QKD in which a receiver transmits an alignment beam and detects a retro-reflected version of the beam
    1.
    发明专利
    Alignment system for freespace QKD in which a receiver transmits an alignment beam and detects a retro-reflected version of the beam 未知

    公开(公告)号：GB2460252A

    公开(公告)日：2009-11-25

    申请号：GB0809227

    申请日：2008-05-21

    Applicant: HEWLETT PACKARD DEVELOPMENT CO

    Inventor： DULIGALL JOANNA ,  HARRISON KEITH ALEXANDER ,  MUNRO WILLIAM JOHN ,  SPILLER TIMOTHY PAUL ,  IONICIOIU RADU

    IPC: H04B10/114 ,  H04L9/08

    Abstract: Quantum key distribution (QKD) receiving apparatus (20) is provided with an alignment-correction system (51-67) for correcting misalignment of a quantum signal received at an optical port (200) of the apparatus relative to a quantum-signal detector (42) of the receiving apparatus. The alignment-correction system comprising a misalignment measuring subsystem (51-57) for making misalignment measures, and a misalignment compensation subsystem (61-67) for adjusting the relative alignment of the quantum signal and quantum-signal detector (42) in dependence on the misalignment measures made. The misalignment measuring subsystem comprises an alignment-beam source (51), an alignment-beam detector arrangement (55, 56), and optical components (52, 53) for guiding an alignment beam from the alignment-beam source (51) to the optical port (200), and for guiding the alignment beam, after external retro-reflection at a cooperating QKD transmitting apparatus (10) from the optical port (200) to the alignment-beam detector arrangement (55, 56).

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