[16a-423-1~12] 1.5 Instrumentation, measurement and Metrology

[16a-423-7] Spin Resonace at the Quantum Limit

〇Yuimaru Kubo^1,2,3, Audrey Bienfait³, Jarryd Pla⁴, John Morton⁴, Patrice Bertet³ (1.OIST, 2.JST PRESTO, 3.CEA-Saclay, 4.Univ. College London)

Keywords:Spin Resonance, Hybrid Quantum Systems, Superconducting Quantum Circuits

The detection and characterization of paramagnetic species by electron-spin resonance (ESR) spectroscopy rely on the inductive detection of the small microwave signals emitted by the spins during their Larmor precession into a microwave resonator in which they are placed. Using the tools offered by circuit Quantum Electrodynamics (QED), namely high quality factor superconducting micro-resonators and Josephson parametric amplifiers that operate at the quantum limit when cooled at 20mK [1], we report an increase of the sensitivity of inductively detected ESR by 4 orders of magnitude better than the state-of-the-art, enabling the detection of 1700 Bismuth donor spins in silicon with a signal-to-noise ratio of 1 in a single echo [2].
[1] Zhou et al., Phys. Rev. B 89, 214517 (2014).
[2] Bienfait et al., Nature Nanotech. 11, pp253–257 (2016).