抄録
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.
本文言語 | English |
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論文番号 | 014401 |
ジャーナル | Physical Review B - Condensed Matter and Materials Physics |
巻 | 71 |
号 | 1 |
DOI | |
出版ステータス | Published - 2005 1月 |
ASJC Scopus subject areas
- 電子材料、光学材料、および磁性材料
- 凝縮系物理学