Direct estimation of functionals of density operators by local operations and classical communication

C M  Alves; P  Horodecki; D K L  Oi; L C  Kwek; A K  Ekert

doi:10.1103/PhysRevA.68.032306

Direct estimation of functionals of density operators by local operations and classical communication

C M Alves, P Horodecki, D K L Oi, L C Kwek, A K Ekert

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Abstract

We present a method of direct estimation of important properties of a shared bipartite quantum state, within the "distant laboratories" paradigm, using only local operations and classical communication. We apply this procedure to spectrum estimation of shared states, and locally implementable structural physical approximations to incompletely positive maps. This procedure can also be applied to the estimation of channel capacity and measures of entanglement.

Original language	English
Article number	032306
Pages (from-to)	-
Number of pages	4
Journal	Physical Review A
Volume	68
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevA.68.032306
Publication status	Published - Sept 2003

Keywords

entanglement
density operators
channel capacity
quantum state

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10.1103/PhysRevA.68.032306

0304123v1Submitted manuscript, 153 KB

Cite this

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AU - Kwek, L C

AU - Ekert, A K

PY - 2003/9

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AB - We present a method of direct estimation of important properties of a shared bipartite quantum state, within the "distant laboratories" paradigm, using only local operations and classical communication. We apply this procedure to spectrum estimation of shared states, and locally implementable structural physical approximations to incompletely positive maps. This procedure can also be applied to the estimation of channel capacity and measures of entanglement.

KW - entanglement

KW - density operators

KW - channel capacity

KW - quantum state

UR - http://arxiv.org/PS_cache/quant-ph/pdf/0304/0304123v1.pdf

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Direct estimation of functionals of density operators by local operations and classical communication

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