dorsal/arxiv
View SchemaQuantum Capacity of a dephasing channel with memory
| Authors | Antonio D'Arrigo, Giuliano Benenti, Giuseppe Falci |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0703014 |
| URL | https://arxiv.org/abs/quant-ph/0703014 |
| DOI | 10.1088/1367-2630/9/9/310 |
| Journal | New J. Phys. 9, 310 (2007) |
Abstract
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.
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"abstract": "We show that the amount of coherent quantum information that can be reliably\ntransmitted down a dephasing channel with memory is maximized by separable\ninput states. In particular, we model the channel as a Markov chain or a\nmultimode environment of oscillators. While in the first model the maximization\nis achieved for the maximally mixed input state, in the latter it is convenient\nto exploit the presence of a decoherence-protected subspace generated by memory\neffects. We explicitly compute the quantum channel capacity for the first model\nwhile numerical simulations suggest a lower bound for the latter. In both cases\nmemory effects enhance the coherent information. We present results valid for\narbitrary size of the input.",
"arxiv_id": "quant-ph/0703014",
"authors": [
"Antonio D\u0027Arrigo",
"Giuliano Benenti",
"Giuseppe Falci"
],
"categories": [
"quant-ph",
"cond-mat.mes-hall"
],
"doi": "10.1088/1367-2630/9/9/310",
"journal_ref": "New J. Phys. 9, 310 (2007)",
"title": "Quantum Capacity of a dephasing channel with memory",
"url": "https://arxiv.org/abs/quant-ph/0703014"
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