DYNAMICS OF STATISTICAL DISTANCE - QUANTUM LIMITS FOR 2-LEVEL CLOCKS

被引：18

作者：

BRAUNSTEIN, SL ^{[1
]}

MILBURN, GJ ^{[1
]}

机构：

[1] UNIV QUEENSLAND, DEPT PHYS, ST LUCIA, QLD 4072, AUSTRALIA

来源：

PHYSICAL REVIEW A | 1995年 / 51卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.51.1820

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the evolution of statistical distance on the Bloch sphere under unitary and nonunitary dynamics. This corresponds to studying the limits to clock precision for a clock constructed from a two-state system. We find that the initial motion away from pure states under nonunitary dynamics yields the greatest accuracy for a ''one-tick'' clock; in this case the clock's precision is not limited by the largest frequency of the system. © 1995 The American Physical Society.

引用

页码：1820 / 1826

页数：7