# Quenching Spin Decoherence in Diamond through Spin Bath Polarization - Quantum Physics

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Abstract: We experimentally demonstrate that the decoherence of a spin by a spin bathcan be completely eliminated by fully polarizing the spin bath. We use electronparamagnetic resonance at 240 gigahertz and 8 Tesla to study the spin coherencetime $T 2$ of nitrogen-vacancy centers and nitrogen impurities in diamond fromroom temperature down to 1.3 K. A sharp increase of $T 2$ is observed below theZeeman energy 11.5 K. The data are well described by a suppression of theflip-flop induced spin bath fluctuations due to thermal spin polarization.$T 2$ saturates at $\sim 250 \mu s$ below 2 K, where the spin bath polarizationis 99.4 %.

Autor: Susumu Takahashi, Ronald Hanson, Johan van Tol, Mark S. Sherwin, David D. Awschalom

Fuente: https://arxiv.org/