Quantum Capacities of Bosonic Channels

Details Quantum Capacities of Bosonic Channels Quantum Capacities of Bosonic Channels

2006-06-15

arxiv.org/abs/quant-ph/0606132v1

Phys. Rev. Lett. 98, 130501 (2007)

Physics

Quantum Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.98.130501

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.

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