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 () and Jörg Wrachtrup ()
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Matthias Pfender: University of Stuttgart
Ping Wang: Beijing Computational Science Research Center
Hitoshi Sumiya: Sumitomo Electric Industries Ltd.
Shinobu Onoda: National Institutes for Quantum and Radiological Science and Technology
Wen Yang: Beijing Computational Science Research Center
Durga Bhaktavatsala Rao Dasari: University of Stuttgart
Philipp Neumann: University of Stuttgart
Xin-Yu Pan: Chinese Academy of Sciences
Junichi Isoya: University of Tsukuba
Ren-Bao Liu: The Chinese University of Hong Kong
Jörg Wrachtrup: University of Stuttgart

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Nuclear magnetic resonance (NMR) of single spins have recently been detected by quantum sensors. However, the spectral resolution has been limited by the sensor’s relaxation to a few kHz at room temperature. This can be improved by using quantum memories, at the expense of sensitivity. In contrast, classical signals can be measured with exceptional spectral resolution by using continuous measurement techniques, without compromising sensitivity. When applied to single-spin NMR, it is critical to overcome the impact of back action inherent of quantum measurement. Here we report sequential weak measurements on a single 13C nuclear spin. The back-action 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.

Date: 2019
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DOI: 10.1038/s41467-019-08544-z

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