Ultra-long coherence times amongst room-temperature solid-state spins
Ultra-long coherence times amongst room-temperature solid-state spins
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DOI：
10.1038/s41467-019-11776-8
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发表时间：
2019-08-28
影响因子：
16.6
通讯作者：
Mizuochi, N.
中科院分区：
文献类型：
--
作者：
Herbschleb, E. D.;Kato, H.;Mizuochi, N.
固态单自旋是量子传感，量子信息处理和量子网络的有前途的资源，因为它们与可扩展的量子器件工程兼容。然而，其相干时间的延长证明具有挑战性。虽然自旋为零的C-12和Si-28同位素的富集大大降低了金刚石和硅中的自旋浴退相干，但固态环境提供了电子自旋与其周围剩余自旋之间的有害相互作用。在这里，我们证明，与普遍认为的相反，掺杂（磷）的n型单晶金刚石实现了非常长的自旋相干时间。单电子自旋表现出最长的非均匀自旋退相时间（T-2* 约为1.5 ms）和哈恩回波自旋相干时间（T-2约为2.4 ms），导致最好的灵敏度在室温固态系统中观察到。金刚石半导体中相干时间的延长可能会在量子技术中产生新的应用。
Solid-state single spins are promising resources for quantum sensing, quantum-information processing and quantum networks, because they are compatible with scalable quantum-device engineering. However, the extension of their coherence times proves challenging. Although enrichment of the spin-zero C-12 and Si-28 isotopes drastically reduces spin-bath decoherence in diamond and silicon, the solid-state environment provides deleterious interactions between the electron spin and the remaining spins of its surrounding. Here we demonstrate, contrary to widespread belief, that an impurity-doped (phosphorus) n-type single-crystal diamond realises remarkably long spin-coherence times. Single electron spins show the longest inhomogeneous spin-dephasing time (T-2* approximate to 1.5 ms) and Hahn-echo spin-coherence time (T-2 approximate to 2.4 ms) ever observed in room-temperature solid-state systems, leading to the best sensitivities. The extension of coherence times in diamond semiconductor may allow for new applications in quantum technology.