Engineering tunable interactions via parametric flux modulation in 3D - Part II*

Quantum memories made of 3D superconducting cavities show potential due to their high quality factor and large Hilbert space. In 2D architectures, using parametric flux drives to achieve coherent processes has been shown to be a promising alternative to the usual voltage-driven schemes. Combining the highly coherent 3D memories with fast flux modulation to attain high-fidelity gates is tempting but has remained a challenging task. In this talk, we present the experimental implementation of a novel design that allows efficient delivery of both AC flux and DC flux into a 3D package, without driving the charge degree of freedom. Using this architecture, we flux-drive a DC SQUID enabling a fast photon-swapping interaction between two modes. We extract circuit parameters and show through simulation the potential for a high-fidelity beamsplitting process. We demonstrate the versatility of our design by showing different drive schemes in this package and discuss their potential advantages.