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Experimental Proposal for Achieving Superadditive Communication Capacities with a Binary Quantum Alphabet

J. R. Buck·S. J. van Enk·Christopher A. Fuchs
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Abstract

We demonstrate superadditivity in the communication capacity of a binary alphabet consisting of two nonorthogonal quantum states. For this scheme, collective decoding is performed two transmissions at a time. This improves upon the previous schemes of Sasaki et al. [Phys. Rev. A 58, 146 (1998)] where superadditivity was not achieved until a decoding of three or more transmissions at a time. This places superadditivity within the regime of a near-term laboratory demonstration. We propose an experimental test based upon an alphabet of low photon-number coherent states where the signal decoding is done with atomic state measurements on a single atom in a high-finesse optical cavity.

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J. R. Buck, S. J. van Enk, Christopher A. Fuchs. 1999-03-23. Experimental Proposal for Achieving Superadditive Communication Capacities with a Binary Quantum Alphabet. https://doi.org/10.1103/physreva.61.032309

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