A Complete Classification of Quantum Ensembles having a Given Density Matrix

Hughston, L P; Jozsa, R and Wootters, W K. 2002. A Complete Classification of Quantum Ensembles having a Given Density Matrix. Physics Letters A, 183(1), pp. 14-18. ISSN 03759601 [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:

DateEvent
4 October 1993Accepted
23 September 2002Published

Item ID:

31593

Date Deposited:

14 Mar 2022 11:00

Last Modified:

14 Mar 2022 11:00

Peer Reviewed:

Yes, this version has been peer-reviewed.

URI:

https://research.gold.ac.uk/id/eprint/31593

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