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TT: Fachverband Tiefe Temperaturen
TT 73: Superconducting Electronics: Qubits II (joint session TT/QI)
TT 73.4: Talk
Thursday, March 21, 2024, 15:45–16:00, H 2053
Longitudinal coupling between a molecular spin ensemble and a superconducting resonator — •Simon Günzler1,2, Dennis Rieger2, Thomas Koch2, Kiril Borisov2, Patrick Winkel2, Grigore Timco3, Richard E.P. Winpenny3, Ioan M. Pop1,2, and Wolfgang Wernsdorfer1,2 — 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