Control of a two-level quantum system in a coherent feedback scheme

被引：8
|
作者：
Albertini, Francesca [1 ]
D'Alessandro, Domenico [2 ]
机构：
[1] Univ Padua, Dipartimento Matemat Pura & Applicata, I-35100 Padua, Italy
[2] Iowa State Univ, Dept Math, Ames, IA USA
来源：
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL | 2013年 / 46卷 / 04期
基金：
美国国家科学基金会;
关键词：
CONTROLLABILITY;
D O I：
10.1088/1751-8113/46/4/045301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We consider a scheme for the control of a spin 1/2, S, where an auxiliary spin 1/2, A, plays the role of the controller, and an Ising interaction is assumed between the spins. We demonstrate that even if there is no complete controllability on the system S + A we can have full control on the system S if and only if the initial state of A is pure. This provides the simplest example where the system S is indirectly controllable while the whole system S + A is not completely controllable. We also give an explicit algorithm for the indirect control of S.
引用
收藏
页数：8
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