Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 73: Quantum Sensing: Applications & Spectroscopy
FM 73.8: Talk
Thursday, September 26, 2019, 15:45–16:00, Aula
Hyperpolarization and Bath Spectroscopy of Individual 13C Nuclei in Diamond — •K. Herb, K.S. Cujia, J. Zopes, and C.L. Degen — Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland
70 years ago, Erwin Hahn published the first experimental demonstration of a Free Induction Decay (FID) experiment. Advances in quantum optics and material science enable us today to record the free precession signal of single 13C nuclear spins inside a diamond crystal. The experimental instrumentation to achieve this sensitivity is not of a classical and macroscopic scale as in Hahn’s experiment, but rather of a microscopic scale. Indeed, the sensor is an electron spin: the electron spin of the Nitrogen-Vacancy (NV) center in diamond. In this talk, we focus on two key challenges towards single molecule NMR spectroscopy: the hyperpolarization of single nuclei in the vicinity of the NV center at room temperature and the detection scheme. We use the hyperfine coupling of the nuclei to the NV center to transfer electron spin polarization in a ramped-amplitude NOVEL-like scheme. By modulating the amplitude of the spin-lock pulse, we improved the robustness and the efficiency of the protocol for polarizing multiple nuclear spins with a priori unknown hyperfine couplings. To detect the nuclear spins, we propose the use of periodic weak measurements. This allows a continuous FID detection at the single spin level. By that, we demonstrate sensitive, high-resolution NMR spectroscopy of multiple individually resolvable nuclear spins in the vicinity of the NV center.