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

被引：40

作者：

Alves, CM

Horodecki, P

Oi, DKL

Kwek, LC

Ekert, AK

机构：

[1] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[2] Univ Cambridge, DAMTP, Ctr Quantum Computat, Cambridge CB3 0WA, England

[3] Gdansk Univ Technol, Fac Appl Phys & Math, PL-80952 Gdansk, Poland

[4] Nanyang Technol Univ, Natl Inst Educ, Dept Nat Sci, Singapore 637616, Singapore

[5] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

来源：

PHYSICAL REVIEW A | 2003年 / 68卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.68.032306

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：4

共 13 条

[1]

Bennett CH, 1996, PHYS REV A, V54, P3824, DOI 10.1103/PhysRevA.54.3824

[2] Direct estimations of linear and nonlinear functionals of a quantum state [J].