dorsal/arxiv
View SchemaOn the structure of optimal sets for tensor product channel
| Authors | M. E. Shirokov |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0402178 |
| URL | https://arxiv.org/abs/quant-ph/0402178 |
| Journal | Problems of Information Transmission, Vol. 42, No. 4, (2006), 23--40 |
Abstract
For a given quantum channel we consider two optimal sets of states, related to the Holevo capacity and to the minimal output entropy of this channel. Some properties of these sets as well as the necessary and sufficient condition for their coincidence are obtained. The relations between additivity properties for two quantum channels and the structure of the optimal sets for tensor product of these channels are considered. It turns out that these additivity properties are connected with the special hereditary property of the optimal sets for tensor product channel. We explore the structural properties of these optimal sets under two different assumptions. The first assumption means that for tensor product of two channels with arbitrary constraints there exists optimal ensemble with the product state average. It turns out that exactly this assumption guarantees hereditary property of the both optimal sets for tensor product channel and provides some observations concerning the additivity problems. The second assumption means additivity of the Holevo capacity for two channels with arbitrary constraints. It turns out that exactly this assumption guarantees strong hereditary property of the both optimal sets for tensor product channel and provides the natural "projective" relations between these sets and the optimal sets for single channels.
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"abstract": "For a given quantum channel we consider two optimal sets of states, related\nto the Holevo capacity and to the minimal output entropy of this channel. Some\nproperties of these sets as well as the necessary and sufficient condition for\ntheir coincidence are obtained. The relations between additivity properties for\ntwo quantum channels and the structure of the optimal sets for tensor product\nof these channels are considered. It turns out that these additivity properties\nare connected with the special hereditary property of the optimal sets for\ntensor product channel. We explore the structural properties of these optimal\nsets under two different assumptions.\n The first assumption means that for tensor product of two channels with\narbitrary constraints there exists optimal ensemble with the product state\naverage. It turns out that exactly this assumption guarantees hereditary\nproperty of the both optimal sets for tensor product channel and provides some\nobservations concerning the additivity problems.\n The second assumption means additivity of the Holevo capacity for two\nchannels with arbitrary constraints. It turns out that exactly this assumption\nguarantees strong hereditary property of the both optimal sets for tensor\nproduct channel and provides the natural \"projective\" relations between these\nsets and the optimal sets for single channels.",
"arxiv_id": "quant-ph/0402178",
"authors": [
"M. E. Shirokov"
],
"categories": [
"quant-ph"
],
"journal_ref": "Problems of Information Transmission, Vol. 42, No. 4, (2006),\n 23--40",
"title": "On the structure of optimal sets for tensor product channel",
"url": "https://arxiv.org/abs/quant-ph/0402178"
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