Toward Photon-Efficient Key Distribution Over Optical Channels
Author(s)Kochman, Yuval; Wang, Ligong; Wornell, Gregory W.
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This paper considers the distribution of a secret key over an optical (bosonic) channel in the regime of high photon efficiency, i.e., when the number of secret key bits generated per detected photon is high. While, in principle, the photon efficiency is unbounded, there is an inherent tradeoff between this efficiency and the key generation rate (with respect to the channel bandwidth). We derive asymptotic expressions for the optimal generation rates in the photon-efficient limit, and propose schemes that approach these limits up to certain approximations. The schemes are practical, in the sense that they use coherent or temporally entangled optical states and direct photodetection, all of which are reasonably easy to realize in practice, in conjunction with off-the-shelf classical codes.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
IEEE Transactions on Information Theory
Institute of Electrical and Electronics Engineers (IEEE)
Kochman, Yuval, Ligong Wang, and Gregory W. Wornell. “Toward Photon-Efficient Key Distribution Over Optical Channels.” IEEE Trans. Inform. Theory 60, no. 8 (August 2014): 4958–4972.
Author's final manuscript