Sofia Gonzalez Garcia: On-demand parametric interaction between the dipole and plasma modes of a SNAIL with engineered asymmetries

Abstract: 

Qubits based on Josephson junctions are at the core of the most advanced superconducting quantum processors. Typically, the coupling between these qubits decreases as the detuning between their transition frequencies increases. Therefore, superconducting quantum circuits often suffer from frequency crowding, which can deteriorate the performances of any driven operations. In this talk, we demonstrate a novel, hardware-efficient approach for performing on-demand photon swaps in as little as 5 nsnbetween two transmon-like qubits with transition frequencies of 8.4 GHz and 23.8 GHz. The superconducting loop shunted by a capacitance, with a total footprint of approximately 0.01 mm². Our device sets the stage for the development of compact superconducting devices capable of fast, high fidelity quantum operations between modes with >15 GHz of detuning for applications in quantum information processing and quantum sensing.