Inductive-detection electron-spin resonance spectroscopy with $\mathbf{65}\,$spins$/\sqrt{\text{Hz}}$ sensitivity
S. Probst,Audrey Bienfait,Philippe Campagne-Ibarcq,Jarryd J. Pla,B. Albanese,J. F. Da Silva Barbosa,Thomas Schenkel,Denis Vion,Daniel Esteve,Klaus Mølmer,John J. L. Morton,Reinier Heeres,Patrice Bertet +12 more
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TLDR
In this article, the authors report electron spin resonance spectroscopy measurements performed at millikelvin temperatures in a custom-built spectrometer comprising a superconducting micro-resonator at $7$ GHz and a Josephson parametric amplifier.Abstract:
We report electron spin resonance spectroscopy measurements performed at millikelvin temperatures in a custom-built spectrometer comprising a superconducting micro-resonator at $7$ GHz and a Josephson parametric amplifier. Owing to the small ${\sim}10^{-12}\lambda^3$ magnetic resonator mode volume and to the low noise of the parametric amplifier, the spectrometer sensitivity reaches $260\pm40$ spins$/$echo and $65\pm10$ $\mathrm{spins}/\sqrt{\text{Hz}}$, respectively.read more
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