Gaussian bosonic synergy: quantum communication via realistic channels of zero quantum capacity

Details Gaussian bosonic synergy: quantum communication via realistic channels of zero quantum capacity Gaussian bosonic synergy: quantum communication via realistic channels of zero quantum capacity

2011-02-22

arxiv.org/abs/1102.4580v1

Physics

Quantum Physics

5 pages, 4 figures, one appendix

Scientific paper

As with classical information, error-correcting codes enable reliable transmission of quantum information through noisy or lossy channels. In contrast to the classical theory, imperfect quantum channels exhibit a strong kind of synergy: there exist pairs of discrete memoryless quantum channels, each of zero quantum capacity, which acquire positive quantum capacity when used together. Here we show that this "superactivation" phenomenon also occurs in the more realistic setting of optical channels with attenuation and Gaussian noise. This paves the way for its experimental realization and application in real-world communications systems.

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