Decoherence dynamics of a single spin versus spin ensemble

TitleDecoherence dynamics of a single spin versus spin ensemble
Publication TypeJournal Article
Year of Publication2008
AuthorsDobrovitski VV, Feiguin AE, Awschalom DD, Hanson R
Journal TitlePhysical Review B
Volume77
Pages245212
Date PublishedJun
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000257289700058
Keywordscoherent dynamics, diamond, DOTS, electron, QUANTUM INFORMATION
Abstract

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.

DOI10.1103/PhysRevB.77.245212
Alternate JournalPhys. Rev. B