Pulsed electron spin resonance of an organic microcrystal by dispersive readout
Journal article, 2020

We establish a testbed system for the development of high-sensitivity Electron Spin Resonance (ESR) techniques for small samples at cryogenic temperatures. Our system consists of a NbN thin-film planar superconducting microresonator designed to have a concentrated mode volume to couple to a small amount of paramagnetic material, and to be resilient to magnetic fields of up to 400mT. At 65mK we measure high-cooperativity coupling (C≈19) to an organic radical microcrystal containing 1012 spins in a pico-litre volume. We detect the spin–lattice decoherence rate via the dispersive frequency shift of the resonator. Techniques such as these could be suitable for applications in quantum information as well as for pulsed ESR interrogation of very few spins to provide insights into the surface chemistry of, for example, the material defects in superconducting quantum processors.

Dispersive readout

High sensitivity ESR for small volumes

Superconducting resonators


Ailsa K.V. Keyser

Imperial College London

National Physical Laboratory (NPL)

J. Burnett

National Physical Laboratory (NPL)

Sergey Kubatkin

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Andrey Danilov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Mark Oxborrow

Imperial College London

Sebastian Erik de Graaf

National Physical Laboratory (NPL)

Tobias Lindström

National Physical Laboratory (NPL)

Journal of Magnetic Resonance

1090-7807 (ISSN)

Vol. 321 106853

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics





More information

Latest update