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Coherence of single spins coupled to a nuclear spin bath of varying density

N. Mizuochi, P. Neumann, F. Rempp, J. Beck, V. Jacques, P. Siyushev, K. Nakamura, D. J. Twitchen, H. Watanabe, S. Yamasaki, F. Jelezko, and J. Wrachtrup
Phys. Rev. B 80, 041201(R) – Published 13 July 2009
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Abstract

The dynamics of single electron and nuclear spins in a diamond lattice with different C13 nuclear spin concentration is investigated. It is shown that coherent control of up to three individual nuclei in a dense nuclear spin cluster is feasible. The free-induction decays of nuclear spin Bell states and single nuclear coherences among C13 nuclear spins are compared and analyzed. Reduction in a free-induction-decay time T2 and a coherence time T2 upon increase in nuclear spin concentration has been found. For pure diamond, T2 as long as 30μs and T2 of up to 0.65 ms for the electron spin has been observed. The C13 concentration dependence of T2 is explained by Fermi contact and dipolar interactions with nuclei in the lattice. It has been found that T2 decreases approximately as 1/n, where n is C13 concentration, which corresponds to the reported theoretical line of T2 for an electron spin interacting with a nuclear spin bath.

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  • Received 19 June 2009

DOI:https://doi.org/10.1103/PhysRevB.80.041201

©2009 American Physical Society

Authors & Affiliations

N. Mizuochi1,2, P. Neumann3, F. Rempp3, J. Beck3, V. Jacques3, P. Siyushev3, K. Nakamura4, D. J. Twitchen5, H. Watanabe6, S. Yamasaki7, F. Jelezko3, and J. Wrachtrup3

  • 1Graduate School of Library, Information & Media Studies, University of Tsukuba, 1–2 Kasuga, 305-8550, Japan
  • 2PRESTO JST, 4–1–8 Honcho, Kawaguchi, Saitama 332–0012, Japan
  • 33. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
  • 4Tokyo Gas Co., Ltd., 3-13-1 Minamisenju, Tokyo 116-0003, Japan
  • 5Element Six Ltd., King’s Ride Park, Ascot, Berkshire SL5 8BP, United Kingdom
  • 6Diamond Research Center, AIST, Tsukuba Central 2, Tsukuba 305-8568, Japan
  • 7Nanotechnology Research Institute, AIST, Tsukuba Central 2, Tsukuba 305-8568, Japan

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Issue

Vol. 80, Iss. 4 — 15 July 2009

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