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QI: Fachverband Quanteninformation

QI 26: Superconducting Electronics: Qubits II (joint session TT/QI)

QI 26.4: Vortrag

Donnerstag, 21. März 2024, 15:45–16:00, H 2053

Longitudinal coupling between a molecular spin ensemble and a superconducting resonator — •Simon Günzler^1,2, Dennis Rieger², Thomas Koch², Kiril Borisov², Patrick Winkel², Grigore Timco³, Richard E.P. Winpenny³, Ioan M. Pop^1,2, and Wolfgang Wernsdorfer^1,2 — ¹IQMT, Karlsruhe Institute of Technology, Germany — ²PHI, Karlsruhe Institute of Technology, Germany — ³PSI and School of Chemistry, The University of Manchester, UK

Hybrid quantum architectures coupling electronic spin ensembles to superconducting circuits have advanced remarkably in the past decade. So far, however, they rely on transverse coupling schemes, tuning the spin transition in close proximity to the circuit’s frequency. Here, we demonstrate longitudinal coupling between spins in a microcrystal of Cr₇Ni and the kinetic inductance of a granular aluminum superconducting microwave resonator. Remarkably, this enables the measurement of the crystal’s magnetization independent of the detuning between the spin and resonator mode. Separate resonators fabricated from niobium on the same chip allow us to excite and measure the relaxation of the spins more than 2 GHz detuned from the readout resonator.

Keywords: superconducting microwave resonator; hybrid quantum architecture; granular aluminum; kinetic inductance; molecular magnet