Coherence time of decoupled nuclear spins in silicon

T. D. Ladd, D. Maryenko, Y. Yamamoto, E. Abe, Kohei M Itoh

Research output: Contribution to journalArticle

129 Citations (Scopus)

Abstract

We report NMR experiments using high-power rf decoupling techniques to show that a 29Si nuclear spin in a solid silicon crystal at room temperature can preserve quantum phase for 10 9 precessional periods. The coherence times we report are more than four orders of magnitude longer than for any other observed solid-state qubit. We also examine coherence times using magic-angle-spinning techniques and in isotopically altered samples. In high-quality crystals, coherence times are limited by residual dipolar couplings and can be further improved by isotopic depletion. In defect-heavy samples, we provide evidence for decoherence limited by a noise process unrelated to the dipolar coupling. The nonexponential character of these data is compared to a theoretical model for decoherence due to the same charge trapping mechanisms responsible for 1/f noise. These results provide insight into proposals for solid-state nuclear-spin-based quantum memories and quantum computers based on silicon.

Original languageEnglish
Article number014401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number1
DOIs
Publication statusPublished - 2005 Jan

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Silicon
nuclear spin
silicon
solid state
memory (computers)
Quantum computers
Charge trapping
Crystals
Magic angle spinning
quantum computers
decoupling
metal spinning
crystals
proposals
depletion
trapping
Nuclear magnetic resonance
Data storage equipment
Defects
nuclear magnetic resonance

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Coherence time of decoupled nuclear spins in silicon. / Ladd, T. D.; Maryenko, D.; Yamamoto, Y.; Abe, E.; Itoh, Kohei M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 1, 014401, 01.2005.

Research output: Contribution to journalArticle

Ladd, T. D. ; Maryenko, D. ; Yamamoto, Y. ; Abe, E. ; Itoh, Kohei M. / Coherence time of decoupled nuclear spins in silicon. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 71, No. 1.
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