Electron paramagnetic resonance spectroscopy using a single artificial atom
Abstract
Electron paramagnetic resonance (EPR) spectroscopy is an important technology in physics, chemistry, materials science, and biology. Sensitive detection with a small sample volume is a key objective in these areas, because it is crucial, for example, for the readout of a highly packed spin based quantum memory or the detection of transition metals in biomaterials. Here, we demonstrate a novel EPR spectrometer using a single artificial atom as a sensitive detector of spin magnetization. The artificial atom, a superconducting flux qubit, provides advantages in terms of its strong coupling with magnetic fields. We estimate a sensitivity of ~400 spins·Hz‑1/2 with a magnetic sensing volume around 10‑14λ3 (50 femtoliters), where λ is the wavelength of the irradiated microwave. Our artificial atom works as a highly sensitive EPR spectrometer with micron-scale area with future opportunity for measuring single spins on the nanometer scale.
- Publication:
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Communications Physics
- Pub Date:
- December 2019
- DOI:
- 10.1038/s42005-019-0133-9
- arXiv:
- arXiv:1711.10148
- Bibcode:
- 2019CmPhy...2...33T
- Keywords:
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- Quantum Physics
- E-Print:
- Commun Phys 2, 33 (2019)