In-Situ Engineering of the Anisotropic Rabi Model in Circuit QED

Abstract

The anisotropic Rabi model (ARM), which features tunable Jaynes-Cummings (JC) and anti-Jaynes-Cummings (AJC) interactions, has remained challenging to realize fully. We present a circuit QED architecture featuring a qubit, a resonator, and a flux-tunable coupler that provides complete dynamic control over the ARM Hamiltonian. By leveraging simultaneous capacitive and inductive couplings, we can in-situ tune the interaction from the pure JC to the pure AJC regime without requiring external parametric modulation. This dynamic control enables useful quantum measurement and coherence capabilities, including dispersive shift cancellation for protection against photon shot-noise dephasing, and Purcell-suppressed readout. Our work establishes a versatile platform for exploring the ARM's full parameter space and its broader applications in quantum information processing.