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arXiv 1607.02553cond-mat.mes-hall
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双量子自旋弛豫对近表面氮空位中心相干性的限制

Double-quantum spin-relaxation limits to coherence of near-surface nitrogen-vacancy centers

Bryan A. Myers, Amila Ariyaratne, Ania C. Bleszynski Jayich

摘要:

我们探测了金刚石近表面氮空位(NV)中心的完整三能级自旋系统的弛豫动力学,以定义$T_{1}$弛豫时间,该弛豫时间有助于解决NV子集量子位叠加的$T_{2} \leq 2T_{1}$相干极限。我们发现,双量子自旋弛豫通过电场噪声占主导地位的$T_{1}$的近表面纳米粒子在低施加的磁场。此外,我们区分$1/f^α$光谱的电场和磁场噪声使用一种新的噪声光谱技术,在探测材料界面的表面诱导退相干具有广泛的应用。

英文摘要:

We probe the relaxation dynamics of the full three-level spin system of near-surface nitrogen-vacancy (NV) centers in diamond to define a $T_{1}$ relaxation time that helps resolve the $T_{2} \leq 2T_{1}$ coherence limit of the NV's subset qubit superpositions. We find that double-quantum spin relaxation via electric field noise dominates $T_{1}$ of near-surface NVs at low applied magnetic fields. Furthermore, we differentiate $1/f^α$ spectra of electric and magnetic field noise using a novel noise-spectroscopy technique, with broad applications in probing surface-induced decoherence at material interfaces.

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