Quantum Capacities of Bosonic Channels

Abstract

We investigate the capacity of bosonic quantum channels for the transmission of quantum information. Achievable rates are determined from measurable moments of the channel by showing that every channel can asymptotically simulate a Gaussian channel which is characterized by second moments of the initial channel. We calculate the quantum capacity for a class of Gaussian channels, including channels describing optical fibers with photon losses, by proving that Gaussian encodings are optimal. Along the way we provide a complete characterization of degradable Gaussian channels and those arising from teleportation protocols.

5 pages, 2 figures

References in corpus (2)

• Experimental demonstration of quantum memory for light
• Degradability of Bosonic Gaussian channels

Cited by in corpus (11)

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• Experimental characterization of Gaussian quantum communication channels
• Not-so-normal mode decomposition
• Capacities of lossy bosonic channel with correlated noise
• Qubit quantum channels: A characteristic function approach
• Non-Markovian decoherence dynamics of entangled coherent states
• A new approach to characterize qubit channels