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Quenching Spin Decoherence in Diamond through Spin Bath Polarization

Susumu Takahashi, Ronald Hanson, Johan van Tol, Mark S. Sherwin, and David D. Awschalom
Phys. Rev. Lett. 101, 047601 – Published 23 July 2008
Physics logo See Synopsis: Quantum coherence in cold baths

Abstract

We experimentally demonstrate that the decoherence of a spin by a spin bath can be completely eliminated by fully polarizing the spin bath. We use electron paramagnetic resonance at 240 GHz and 8 T to study the electron-spin coherence time T2 of nitrogen-vacancy centers and nitrogen impurities in diamond from room temperature down to 1.3 K. A sharp increase of T2 is observed below the Zeeman energy (11.5 K). The data are well described by a suppression of the flip-flop induced spin bath fluctuations due to thermal electron-spin polarization. T2 saturates at 250μs below 2 K, where the polarization of the electron-spin bath exceeds 99%.

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  • Received 8 April 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.047601

©2008 American Physical Society

Synopsis

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Quantum coherence in cold baths

Published 28 July 2008

Spin decoherence is a fundamental obstacle in quantum computation and spintronics. Scientists show they can increase the lifetime of a localized spin in a diamond lattice up to 100 times by polarizing the surrounding spins on the lattice.

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Authors & Affiliations

Susumu Takahashi1,*, Ronald Hanson2,3, Johan van Tol4, Mark S. Sherwin1, and David D. Awschalom3

  • 1Department of Physics and Center for Terahertz Science and Technology, University of California, Santa Barbara, California 93106, USA
  • 2Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
  • 3Department of Physics and Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA
  • 4National High Magnetic Field Laboratory, Florida State University, Tallahassee Florida 32310, USA

  • *susumu@iqcd.ucsb.edu

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Issue

Vol. 101, Iss. 4 — 25 July 2008

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