SKM 2023 – scientific programme
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PLV: Plenarvorträge
PLV X
PLV X: Plenary Talk
Thursday, March 30, 2023, 14:00–14:45, HSZ 02
Single-electron-spin-resonance detection by microwave photon counting — •Patrice Bertet1, Zhiren Wang1, Leo Balembois1, Eric Billaud1, Milos Rancic1, Marianne Le Dantec1, Thierry Chaneliere2, Alban Ferrier3, Philippe Goldner3, Sylvain Bertaina4, Denis Vion1, Daniel Esteve1, and Emmanuel Flurin1 — 1Université Paris-Saclay, Gif-sur-Yvette, France — 2Université Grenoble-Alpes, Grenoble, France — 3Université PSL, Paris, France — 4Université Aix-Marseille, Marseille, France
We report a new method for single-electron-spin-resonance spectroscopy at millikelvin temperatures. It consists in measuring the spin fluorescence signal at microwave frequencies using a microwave photon counter based on a superconducting transmon qubit. In our experiment, individual paramagnetic erbium ions in a scheelite crystal of CaWO4 are magnetically coupled to a small-mode-volume, high-quality factor superconducting microwave resonator to enhance their radiative decay rate. We detect the microwave photon spontaneously emitted by a spin following its excitation with a signal-to-noise ratio of 1.9 in one second integration time. Coherence times up to 3 ms are measured, limited by the spin radiative lifetime. The method applies to arbitrary paramagnetic species with long enough non-radiative relaxation time, and offers large detection volumes (10 µm3); as such, it may find applications in magnetic resonance and quantum computing.