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arXiv 1806.02181quant-phcond-mat.mes-hall
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通过顺序弱测量的单个核自旋的高分辨率光谱学

High-resolution spectroscopy of single nuclear spins via sequential weak measurements

Matthias Pfender, Ping Wang, Hitoshi Sumiya, Shinobu Onoda, Wen Yang, Durga Bhaktavatsala Rao Dasari, Philipp Neumann, Xin-Yu Pan, Junichi Isoya, Ren-Bao Liu, J. Wrachtrup

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Article: 16 pages, 4 figures Supplementary: 23 pages, 9 figures
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摘要：

近年来，量子传感器已经实现了对少量或单个核自旋的磁矩的探测和对它们的磁共振信号的测量。然而，光谱分辨率，核磁共振的一个关键特征，已被限制在几kHz的传感器在室温下的松弛。来自单个核自旋的NMR信号的光谱分辨率可以通过例如，使用量子存储器，但以牺牲灵敏度为代价。另一方面，经典信号可以通过使用连续测量技术以出色的光谱分辨率进行测量，而不会影响灵敏度。要将这些技术应用于单自旋NMR，关键是要克服量子测量固有的反作用的影响。在这里，我们报告一个单一的$^{13}$ C核自旋的连续弱测量。重复弱测量的反作用导致自旋经历从相干捕获到相干振荡的量子动力学相变。在室温下的单自旋NMR的光谱分辨率为3.8 Hz。这些结果使测量相关计划的检测非常弱耦合的单自旋的使用。

英文摘要：

Quantum sensors have recently achieved to detect the magnetic moment of few or single nuclear spins and measure their magnetic resonance (NMR) signal. However, the spectral resolution, a key feature of NMR, has been limited by relaxation of the sensor to a few kHz at room temperature. The spectral resolution of NMR signals from single nuclear spins can be improved by, e.g., using quantum memories, however at the expense of sensitivity. Classical signals on the other hand can be measured with exceptional spectral resolution by using continuous measurement techniques, without compromising sensitivity. To apply these techniques to single-spin NMR, it is critical to overcome the impact of back action inherent of quantum measurements. Here we report sequential weak measurements on a single $^{13}$C nuclear spin. The back-action of repetitive weak measurements causes the spin to undergo a quantum dynamics phase transition from coherent trapping to coherent oscillation. Single-spin NMR at room-temperature with a spectral resolution of 3.8 Hz is achieved. These results enable the use of measurement-correlation schemes for the detection of very weakly coupled single spins.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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