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 of nitrogen-vacancy centers and nitrogen impurities in diamond from room temperature down to 1.3 K. A sharp increase of 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. saturates at below 2 K, where the polarization of the electron-spin bath exceeds 99%.
- Received 8 April 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.047601
©2008 American Physical Society
Synopsis
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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