Coupling superconducting circuits to single molecular magnets

Mark David Jenkins Sánchez

Instituto de Ciencia de Materiales de Aragón, CSIC- Universidad de Zaragoza

Superconducting coplanar waveguides and resonators are promising candidates for the realization of realistic quantum computing architectures. These devices are the basis of what has become known as circuit quantum electrodynamics (CQED) and allow for the coupling of microwave radiation to different quantum systems in a strong coupling regime [1]. We study the coupling properties of single molecular magnet qubits from the LnW30 family [2] to this type of circuits and find limits on the strong coupling regime in this case [3]. In order to achieve strong coupling to these qubits we have designed, fabricated and tested nanometer wide constrictions in the centerline of coplanar waveguide resonators. We find that the resonator properties are conserved while allowing us to increase the field in the vicinity of the constriction possibly allowing us to achieve strong coupling to small ensembles of qubits in the near future.

[1] R. J. Schoelkopf and S. M. Girvin, Nature 451, 664-669 (2008)

[2] S. Cardona-Serra et al., J. Am. Chem. Soc. 134 (36), 14982–14990 (2012)

[3] Mark Jenkins et al., New J. Phys. 15 095007 (2013)