Entangled quantum states as direction indicators

被引：81

作者：

Peres, A ^{[1
]}

Scudo, PF ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.86.4160

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider the use of N spin-1/2 particles for indicating a direction in space. If N > 2, their optimal state is entangled. For large N. the mean square error decreases as N-2 (rather than N-1 for parallel spins).

引用

页码：4160 / 4162

页数：3

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