The extension of the spin coherence times is a crucial issue for quantum information and quantum sensing. In solid state systems, suppressing noises with various techniques have been demonstrated. On the other hand, an electrical control for suppression is important toward individual controls of on-chip quantum information devices. Here we show the electrical control for extension of the spin coherence times of 40 nm-deep ion-implanted single nitrogen vacancy center spins in diamond by suppressing magnetic noises. We applied 120 V DC across two contacts spaced by 10 micrometers. The spin coherence times, estimated from a free-induction-decay and a Hahn-echo decay, were increased up to about 10 times (reaching 10 microseconds) and 1.4 times (reaching 150 microseconds), respectively. From the quantitative analysis, the dominant decoherence source depending on the applied static electric field was elucidated. The electrical control for extension can deliver a sensitivity enhancement to the DC sensing of temperature, pressure and electric (but not magnetic) fields, opening a new technique in solid-state quantum information devices. ${}^{*}$Corresponding author: {mizuochi@scl.kyoto-u.ac.jp …

中文翻译：

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电气控制，用于延长金刚石中离子注入氮空位中心的拉姆齐自旋相干时间

自旋相干时间的延长是量子信息和量子感测的关键问题。在固态系统中，已经证明了使用各种技术来抑制噪声。另一方面，用于抑制的电控制对于片上量子信息设备的单独控制很重要。在这里，我们显示了通过抑制磁噪声来扩展金刚石中40 nm深离子注入的单个氮空位中心自旋的自旋相干时间的电控制。我们在相距10微米的两个触点上施加了120 V DC。根据自由感应衰减和哈恩回波衰减估计的自旋相干时间分别增加了约10倍（达到10微秒）和1.4倍（达到150微秒）。从定量分析来看 阐明了取决于所施加的静电电场的主要退相干源。扩展的电气控制可以提高温度，压力和电场（但不包括磁场）的直流感测的灵敏度，从而为固态量子信息设备开辟了新技术。${}^{*}$通讯作者：{mizuochi@scl.kyoto-u.ac.jp…