Quantum Capacity of a dephasing channel with memory
| dc.creator | D'Arrigo, Antonio | |
| dc.creator | Benenti, Giuliano | |
| dc.creator | Falci, Giuseppe | |
| dc.date | 2007-03-02 | |
| dc.date | 2007-08-03 | |
| dc.date.accessioned | 2026-07-07T08:28:04Z | |
| dc.date.available | 2026-07-07T08:28:04Z | |
| dc.description | We show that the amount of coherent quantum information that can be reliably transmitted down a dephasing channel with memory is maximized by separable input states. In particular, we model the channel as a Markov chain or a multimode environment of oscillators. While in the first model the maximization is achieved for the maximally mixed input state, in the latter it is convenient to exploit the presence of a decoherence-protected subspace generated by memory effects. We explicitly compute the quantum channel capacity for the first model while numerical simulations suggest a lower bound for the latter. In both cases memory effects enhance the coherent information. We present results valid for arbitrary size of the input. | |
| dc.description | Revised version, to be published in New Journal of Physics | |
| dc.identifier | https://arxiv.org/abs/quant-ph/0703014 | |
| dc.identifier | http://arxiv.org/abs/quant-ph/0703014 | |
| dc.identifier | New J. Phys. 9, 310 (2007) | |
| dc.identifier | doi:10.1088/1367-2630/9/9/310 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/137484 | |
| dc.subject | Quantum Physics | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Quantum Capacity of a dephasing channel with memory | |
| dc.type | text |