GENERAL FIDELITY LIMIT FOR QUANTUM CHANNELS

Authors
BARNUM H FUCHS CA JOZSA R SCHUMACHER B
Citation
H. Barnum et al., GENERAL FIDELITY LIMIT FOR QUANTUM CHANNELS, Physical review. A, 54(6), 1996, pp. 4707-4711
Citations number
12
Categorie Soggetti
Physics
Journal title
Physical review. A → ACNP
ISSN journal
10502947
Volume
54
Issue
6
Year of publication
1996
Pages
4707 - 4711
Database
ISI
SICI code
1050-2947(1996)54:6<4707:GFLFQC>2.0.ZU;2-T
Abstract
We derive a general limit on the fidelity of a quantum channel conveyi ng an ensemble of pure states. Unlike previous results, this limit app lies to arbitrary coding and decoding schemes. This establishes in ful l generality the quantum noiseless coding theorem, formerly obtained o nly for the special case of unitary decoding schemes.