A COMPLETE CLASSIFICATION OF QUANTUM ENSEMBLES HAVING A GIVEN DENSITY-MATRIX

被引：462

作者：

HUGHSTON, LP

JOZSA, R

WOOTTERS, WK

机构：

[1] UNIV MONTREAL,DEPT IRO,MONTREAL H3C 3J7,QUEBEC,CANADA

[2] WILLIAMS COLL,DEPT PHYS,WILLIAMSTOWN,MA 01267

来源：

PHYSICS LETTERS A | 1993年 / 183卷 / 01期

关键词：

D O I：

10.1016/0375-9601(93)90880-9

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 rho can be created at space-like separation using an entangled state depending only on rho.

引用

页码：14 / 18

页数：5

共 11 条

[1] CAVES CM, COMMUNICATION
[2] INFORMATION AND QUANTUM MEASUREMENT
DAVIES, EB
[J]. IEEE TRANSACTIONS ON INFORMATION THEORY, 1978, 24 (05) : 596 - 599
[3] DESPAGNAT B, 1989, CONCEPTUAL F QUANTUM
[4] GISIN N, 1989, HELV PHYS ACTA, V62, P363
[5] Helstrom C. W., 1976, QUANTUM DETECTION ES, P74
[6] JOZSA R, UNPUB PHYS REV A
[7] NEUMARK THEOREM AND QUANTUM INSEPARABILITY
PERES, A
[J]. FOUNDATIONS OF PHYSICS, 1990, 20 (12) : 1441 - 1453
[8] PERES A, 1993, QUANTUM THEORY CONCE, pCH9
[9] SCHMIDT E, 1906, MATH ANN, V63, P433
[10] SCHUMACHER B, 1990, COMPLEXITY ENTROPY P

← 1 2 →