Lumped element superconducting resonators for electrical control and read-out of molecular spin qubits*

Paramagnetic molecular spin systems strongly coupled to superconducting resonators are promising building blocks for hybrid quantum processors. However, the control of specific operations remains a challenge as the spin coherence times are not yet sufficiently long as compared with the coupling rate. Our approach is to electrically control and read-out the spin state of a high-spin (S = 5/2) paramagnetic manganese(II) molecules embedded in its polar piezoelectric diamagnetic Zn(II) host lattice. We have developed lumped-element resonators (LERs) that, through the resonant microwave fields, modify the local ion coordination modulating the magnetic anisotropy that determines the spin qubit Hamiltonian and transition rates. The use of superconducting microwave resonators implies low losses, high-quality factors and multiplexability which are crucial for this application permitting the simultaneous readout of several qubits. M. C. de Ory and S. Roca contributed equally to this work.