dorsal/arxiv
View SchemaEntanglement-Assisted Classical Capacity of Noisy Quantum Channels
| Authors | Charles H. Bennett, Peter W. Shor, John A. Smolin, Ashish V. Thapliyal |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9904023 |
| URL | https://arxiv.org/abs/quant-ph/9904023 |
| DOI | 10.1103/PhysRevLett.83.3081 |
| Journal | Phys.Rev.Lett.83:3081,1999 |
Abstract
Prior entanglement between sender and receiver, which exactly doubles the classical capacity of a noiseless quantum channel, can increase the classical capacity of some noisy quantum channels by an arbitrarily large constant factor depending on the channel, relative to the best known classical capacity achievable without entanglement. The enhancement factor is greatest for very noisy channels, with positive classical capacity but zero quantum capacity. Although such quantum channels can be simulated classically, no violation of causality is implied, because the simulation requires at least as much forward classical communication as the entanglement-assisted classical capacity of the channel being simulated. We obtain exact expressions for the entanglement-assisted capacity of depolarizing and erasure channels in d dimensions.
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"abstract": "Prior entanglement between sender and receiver, which exactly doubles the\nclassical capacity of a noiseless quantum channel, can increase the classical\ncapacity of some noisy quantum channels by an arbitrarily large constant factor\ndepending on the channel, relative to the best known classical capacity\nachievable without entanglement. The enhancement factor is greatest for very\nnoisy channels, with positive classical capacity but zero quantum capacity.\nAlthough such quantum channels can be simulated classically, no violation of\ncausality is implied, because the simulation requires at least as much forward\nclassical communication as the entanglement-assisted classical capacity of the\nchannel being simulated. We obtain exact expressions for the\nentanglement-assisted capacity of depolarizing and erasure channels in d\ndimensions.",
"arxiv_id": "quant-ph/9904023",
"authors": [
"Charles H. Bennett",
"Peter W. Shor",
"John A. Smolin",
"Ashish V. Thapliyal"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.83.3081",
"journal_ref": "Phys.Rev.Lett.83:3081,1999",
"title": "Entanglement-Assisted Classical Capacity of Noisy Quantum Channels",
"url": "https://arxiv.org/abs/quant-ph/9904023"
},
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