Measuring Central-Spin Interaction with a Spin-Bath by Pulsed ENDOR: Towards Suppression of Spin Diffusion Decoherence

Details Measuring Central-Spin Interaction with a Spin-Bath by Pulsed ENDOR: Towards Suppression of Spin Diffusion Decoherence Measuring Central-Spin Interaction with a Spin-Bath by Pulsed ENDOR: Towards Suppression of Spin Diffusion Decoherence

2012-03-26

arxiv.org/abs/1203.5607v2

Physics

Quantum Physics

Scientific paper

We present pulsed electron-nuclear double resonance experiments which enable us to quantify and characterize, for the first time, the coupling between bismuth donor spin qubits in Si and the surrounding $^{29}\text{Si}$ impurities; the latter provide the dominant decoherence mechanism (nuclear spin diffusion) at low temperatures ($< 16$ K) in this system. Cluster correlation expansion simulations show near-complete suppression of spin diffusion at optimal working points. The suppression takes the form of sharply peaked divergences of the spin diffusion coherence time, in contrast with previously identified broader regions of insensitivity to classical fluctuations.

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