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Publication - Dr Anthony Laing

    Reference-frame-independent quantum key distribution

    Citation

    Laing, A, Scarani, V, Rarity, J & O'Brien, J, 2010, ‘Reference-frame-independent quantum key distribution’. Physical Review A: Atomic, Molecular and Optical Physics, vol 82 (1)., pp. 012304-1 - 012304-5

    Abstract

    We describe a quantum key distribution protocol based on pairs of entangled qubits that generates a secure key between two partners in an environment of unknown and slowly varying reference frame. A direction of particle delivery is required, but the phases between the computational basis states need not be known or fixed. The protocol can simplify the operation of existing setups and has immediate applications to emerging scenarios such as earth-to-satellite links and the use of integrated photonic waveguides. We compute the asymptotic secret key rate for a two-qubit source, which coincides with the rate of the six-state protocol for white noise. We give the generalization of the protocol to higher-dimensional systems and detail a scheme for physical implementation in the three-dimensional qutrit case.

    Full details in the University publications repository