Hughston, L P; Jozsa, R and Wootters, W K. 1993. A Complete Classification of Quantum Ensembles having a Given Density Matrix. Physics Letters A, 183(1), pp. 14-18. ISSN 0375-9601 [Article]

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Abstract or Description

A complete constructive classification is given for all discrete ensembles of pure quantum states having a given density matrix. As a special case this provides a classification of positive operator valued measures with finitely many components. We also show that any chosen ensemble consistent with a fixed density matrix ϱ can be created at space-like separation using an entangled state depending only on ϱ.

Item Type:	Article
Identification Number (DOI):	https://doi.org/10.1016/0375-9601(93)90880-9
Departments, Centres and Research Units:	Computing
Dates:	Date Event 4 October 1993 Accepted 29 November 1993 Published
Item ID:	31593
Date Deposited:	14 Mar 2022 11:00
Last Modified:	27 Feb 2023 16:02
Peer Reviewed:	Yes, this version has been peer-reviewed.
URI:	https://research.gold.ac.uk/id/eprint/31593

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