Coupling strength estimation for spin chains despite restricted access

被引：97

作者：

Burgarth, Daniel ^{[1
,2
,3
]}

Maruyama, Koji ^{[2
,3
]}

Nori, Franco ^{[2
,3
,4
]}

机构：

[1] Univ Oxford, Math Inst, Oxford OX1 3LB, England

[2] RIKEN, Inst Phys & Chem Res, Adv Sci Inst, Wako, Saitama 3510198, Japan

[3] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

[4] Univ Michigan, Dept Phys, Ctr Theoret Phys, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW A | 2009年 / 79卷 / 02期

关键词：

inverse problems; many-body problems; quantum computing;

D O I：

10.1103/PhysRevA.79.020305

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Quantum control requires full knowledge of the system many-body Hamiltonian. In many cases this information is not directly available due to restricted access to the system. Here we show how to indirectly estimate all the coupling strengths in a spin chain by measuring one spin at the end of the chain. We also discuss the efficiency of this "quantum inverse problem" and give a numerical example.

引用

页数：4

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