Qubit channels that achieve capacity with two states

Berry, Dominic W. (2005) Qubit channels that achieve capacity with two states. Physical Review A - Atomic, Molecular, and Optical Physics, 71 3: 1-9. doi:10.1103/PhysRevA.71.032334

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Author Berry, Dominic W.
Title Qubit channels that achieve capacity with two states
Journal name Physical Review A - Atomic, Molecular, and Optical Physics   Check publisher's open access policy
ISSN 1050-2947
Publication date 2005-03
Sub-type Article (original research)
DOI 10.1103/PhysRevA.71.032334
Open Access Status File (Publisher version)
Volume 71
Issue 3
Start page 1
End page 9
Total pages 9
Editor B. Crasemann
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2005
Language eng
Subject 240301 Atomic and Molecular Physics
780102 Physical sciences
Abstract 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.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Noisy Quantum Channels
Classical Information
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 06:12:17 EST