Quantum Capacities of Bosonic Channels
- 26 March 2007
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 98 (13), 130501
- https://doi.org/10.1103/physrevlett.98.130501
Abstract
We investigate the capacity of bosonic quantum channels for the transmission of quantum information. 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. For arbitrary channels we show that achievable rates can be determined from few measurable parameters by proving that every channel can asymptotically simulate a Gaussian channel which is characterized by second moments of the initial channel. Along the way we provide a complete characterization of degradable Gaussian channels and those arising from teleportation protocols.Keywords
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