dorsal/arxiv
View SchemaEntangled states maximize the two qubit channel capacity for some Pauli channels with memory
| Authors | C. Macchiavello, G. M. Palma, S. Virmani |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0307016 |
| URL | https://arxiv.org/abs/quant-ph/0307016 |
| DOI | 10.1103/PhysRevA.69.010303 |
| Journal | Phys. Rev. A., 69, 010303(R), (2004) |
Abstract
We prove that a general upper bound on the maximal mutual information of quantum channels is saturated in the case of Pauli channels with an arbitrary degree of memory. For a subset of such channels we explicitly identify the optimal signal states. We show analytically that for such a class of channels entangled states are indeed optimal above a given memory threshold. It is noteworthy that the resulting channel capacity is a non-differentiable function of the memory parameter.
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"abstract": "We prove that a general upper bound on the maximal mutual information of\nquantum channels is saturated in the case of Pauli channels with an arbitrary\ndegree of memory. For a subset of such channels we explicitly identify the\noptimal signal states. We show analytically that for such a class of channels\nentangled states are indeed optimal above a given memory threshold. It is\nnoteworthy that the resulting channel capacity is a non-differentiable function\nof the memory parameter.",
"arxiv_id": "quant-ph/0307016",
"authors": [
"C. Macchiavello",
"G. M. Palma",
"S. Virmani"
],
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"quant-ph"
],
"doi": "10.1103/PhysRevA.69.010303",
"journal_ref": "Phys. Rev. A., 69, 010303(R), (2004)",
"title": "Entangled states maximize the two qubit channel capacity for some Pauli channels with memory",
"url": "https://arxiv.org/abs/quant-ph/0307016"
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