Phys. Rev. A 69, 022302 (2004) [8 pages]Holevo-Schumacher-Westmoreland channel capacity for a class of qudit unital channelsReceived 30 April 2003; revised 18 July 2003; published 4 February 2004 Using the unique nature of the average output state of an optimal signalling ensemble, we prove that for a special class of qudit unital channels, the Holevo-Schumacher-Westmoreland channel capacity is C=log2(d)-minρS(E(ρ)), where d is the dimension of the qudit. The result is extended to products of the same class of unital qudit channels. Thus, the connection between the minimum von Neumann entropy at the channel output and the transmission rate for classical information over quantum channels extends beyond the qubit domain. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.69.022302
DOI:
10.1103/PhysRevA.69.022302
PACS:
03.67.Hk
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.