Superconducting diode-like nonlinearities in circuit QED

Superconducting diode-like nonlinearities present significant potential for enhancing quantum technologies, particularly due to the broad application of superconductors in contemporary quantum architectures. Controlling these nonreciprocities in-situ is highly desirable for optimizing circuit functionality. Here, we demonstrate the chiral circuit quantum electrodynamics (cQED) control of superconducting diode-like nonlinearities in both bulk superconductors and Josephson junctions. While the coupling of chiral cQED modes to qubits has been recently demonstrated, we further explore the momentum-dependent light-matter interactions that break time-reversal symmetry, enabling nonreciprocal behavior in circuit elements which can be harnessed for photonic gate operations and quantum-phase edge sensing. We show how these functionalities can be applied across a variety of cavity designs and frequencies, opening new avenues for quantum device engineering.