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

Abstract

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.

5 pages, 4 figures, one appendix

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• Advances in Bosonic Quantum Error Correction with Gottesman-Kitaev-Preskill Codes: Theory, Engineering and Applications
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• Algorithmic Superactivation of Asymptotic Quantum Capacity of Zero-Capacity Quantum Channels
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• Upper bounds on the quantum capacity for general attenuator and amplifier
• A graphical description of optical parametric generation of squeezed states of light
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• Quantum Communications Made Easy: Deterministic Models of Bosonic Channels
• Allowing leakage can increase quantum transmission
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• Bounding the quantum capacity with flagged extensions
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• Quantum Computation and Communication in Bosonic Systems
• Information storage and transmission under Markovian noise
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