Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/80984
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- Title
- Qubit channels that achieve capacity with two states
- Related
- Physical review A. Atomic, molecular, and optical physics, Vol. 71, Issue 3, p.032334-1-032334-9
- DOI
- 10.1103/PhysRevA.71.032334
- Publisher
- American Physical Society
- Date
- 2005
- FoR/RFCD Code(s)
-
020200 Atomic, Molecular, Nuclear, Particle and Plasma Physics
020400 Condensed Matter Physics
020500 Optical Physics
- Author/Creator
- Berry, Dominic W
- Description
- This paper considers a class of qubit channels for which three states are always sufficient to achieve the Holevo capacity. For these channels, it is known that there are cases where two orthogonal states are sufficient, two nonorthogonal states are required, or three states are necessary. Here a systematic theory is given which provides criteria to distinguish cases where two states are sufficient, and determine whether these two states should be orthogonal or nonorthogonal. In addition, we prove a theorem on the form of the optimal ensemble when three states are required, and present efficient methods of calculating the Holevo capacity.
- Description
- 9 page(s)
- Subject Keyword
- 020200 Atomic, Molecular, Nuclear, Particle and Plasma Physics
- Subject Keyword
- 020400 Condensed Matter Physics
- Subject Keyword
- 020500 Optical Physics
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Physics
- Identifier
- http://hdl.handle.net/1959.14/80984
- Identifier
- ISSN:1050-2947
- Identifier
- mq-rm-2006009961
- Language
- eng
- Rights
- Berry DW, Phys. Rev. A. 71(3), 032334, 2005. Copyright 2005 by the American Physical Society. The original article can be found at http://dx.doi.org/10.1103/PhysRevA.71.032334.
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