Additive Extensions of a Quantum Channel
| dc.creator | Smith, Graeme | |
| dc.creator | Smolin, John A. | |
| dc.date | 2007-12-14 | |
| dc.date.accessioned | 2026-07-07T12:43:43Z | |
| dc.date.available | 2026-07-07T12:43:43Z | |
| dc.description | We study extensions of a quantum channel whose one-way capacities are described by a single-letter formula. This provides a simple technique for generating powerful upper bounds on the capacities of a general quantum channel. We apply this technique to two qubit channels of particular interest--the depolarizing channel and the channel with independent phase and amplitude noise. Our study of the latter demonstrates that the key rate of BB84 with one-way post-processing and quantum bit error rate q cannot exceed H(1/2-2q(1-q)) - H(2q(1-q)). | |
| dc.description | 6 pages, one figure | |
| dc.identifier | https://arxiv.org/abs/0712.2471 | |
| dc.identifier | http://arxiv.org/abs/0712.2471 | |
| dc.identifier | Proceedings of the IEEE Information Theory Workshop 2008. pp 368-372 | |
| dc.identifier | doi:10.1109/ITW.2008.4578688 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/220518 | |
| dc.subject | Quantum Physics | |
| dc.title | Additive Extensions of a Quantum Channel | |
| dc.type | text |