Decoherence dynamics of a single spin versus spin ensemble

被引：59

作者：

Dobrovitski, V. V. ^{[1
]}

Feiguin, A. E. ^{[2
,3
]}

Awschalom, D. D. ^{[4
]}

Hanson, R. ^{[5
]}

机构：

[1] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[2] Univ Maryland, College Pk, MD 20742 USA

[3] Univ Calif Santa Barbara, Microsoft Stn Q, Santa Barbara, CA 93106 USA

[4] Univ Calif Santa Barbara, Ctr Spintron & Quantum Computat, Santa Barbara, CA 93106 USA

[5] Delft Univ Technol, Kavli Inst Nanosci Delft, NL-2600 GA Delft, Netherlands

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.77.245212

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study decoherence of central spins by a spin bath, focusing on the difference between measurement of a single central spin and measurement of a large number of central spins (as found in typical spin-resonance experiments). For a dilute spin bath, the single spin demonstrates Gaussian free-induction decay, in contrast to exponential decay characteristic of spin ensembles. A strong difference between a single spin and a spin ensemble also exists for the Rabi oscillation decay: for a repeated Rabi oscillation experiment, suppression of decoherence happens for a single spin while acceleration takes place for a spin ensemble. The mathematical origin of such behavior is similar to quantum Zeno/anti-Zeno effects.

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页数：6

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