Dark evolution in time-varying Zeno subspace

被引：2
作者：
Law, CK [1 ]
机构：
[1] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
来源：
PHYSICAL REVIEW A | 2004年 / 70卷 / 03期
关键词：
D O I：
10.1103/PhysRevA.70.034101
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigate the evolution of a quantum system under the influence of sequential measurements. The measurement scheme distinguishes whether or not the system is in a specified state \f(n)> at the nth step, where \f(n)> varies with n. Dark evolution corresponds to the situation when all measurements give negative results. We show that dark evolution is unitary in the continuous measurement limit. We derive the effective Hamiltonian, and indicate how \f(n)> controls quantum state transport.
引用
收藏
页码：034101 / 1
页数：4
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