Aligning reference frames with quantum states -: art. no. 257903

被引：59

作者：

Bagan, E ^{[1
]}

Baig, M

Muñoz-Tapia, R

机构：

[1] Univ Autonoma Barcelona, Fac Ciencies, Grp Fis Teor, E-08193 Barcelona, Spain

[2] Univ Autonoma Barcelona, Fac Ciencies, IFAE, Edifici Cn, E-08193 Barcelona, Spain

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.87.257903

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We analyze the problem of sending, in a single transmission, the information required to specify an orthogonal trihedron or reference frame through a quantum channel made out of N elementary spins. We analytically obtain the optimal strategy, i.e., the best encoding state and the best measurement. For large N, we show that the average error goes to zero linearly in 1/N. Finally, we discuss the construction of finite optimal measurements.

引用

页码：257903 / 1

页数：4

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