Journal article
Tuning a spin bath through the quantum-classical transition
F Reinhard, F Shi, N Zhao, F Rempp, B Naydenov, J Meijer, LT Hall, L Hollenberg, J Du, RB Liu, J Wrachtrup
Physical Review Letters | Published : 2012
Abstract
We study decoherence of a single nitrogen-vacancy (NV) center induced by the C13 nuclear spin bath of diamond. By comparing Hahn-Echo experiments on single and double-quantum transitions of the NV triplet ground state we demonstrate that this bath can be tuned into two different regimes. At low magnetic fields, the nuclei behave as a quantum bath which causes decoherence by entangling with the NV central spin. At high magnetic fields, the bath behaves as a source of classical magnetic field noise, which creates decoherence by imprinting a random phase on the NV central spin. © 2012 American Physical Society.
Grants
Awarded by Deutsche Forschungsgesellschaft
Awarded by National Natural Science Foundation of China
Awarded by National Fundamental Research Program of China
Funding Acknowledgements
F.R. and J.W. acknowledge financial support from the Baden-Wurttemberg-Stiftung, the Max Planck Society, and the Deutsche Forschungsgesellschaft (FOR 1495), F.S. from the National Natural Science Foundation of China (Project 91021005) and the National Fundamental Research Program of China (Grant No. 2007CB925200), N.Z. and R.B.L. from the Hong Kong RGC and CUHK Focus Investments Scheme and L.T.H and L.H. from the Australian Research Council.