Fidelity for Mixed Quantum States

Author: Richard Jozsa ^a^b

Affiliations:	^a Dpartement IRO, Universit de Montral, Montral, Qubec, Canada
	^b School of Mathematics and Statistics, University of Plymouth, Plymouth, Devon, England

DOI: 10.1080/09500349414552171

Publication Frequency: 21 issues per year

Published in: journal

Journal of Modern Optics, Volume 41, Issue 12 December 1994 , pages 2315 - 2323

Subjects: Fibre Optics; Optics & Optoelectronics.; Optics, Optoelectronic Effects, Devices & Systems; Optoelectronics; Theoretical Physics;

Formats available: PDF (English)

Previously published as: Optica Acta: International Journal of Optics (0030-3909) until 1987

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We propose a definition of fidelity for mixed quantum states in terms of Uhlmann's 'transition probability' formula F(ϱ₁, ϱ₂) = lcub

trace [(√ϱ₁ϱ₂ times

√ϱ₁)^1/2]

² and give new elementary proofs of its essential properties.

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