Towards caviy state boosting with superconducting qubits

Topological band structures are well known to produce symmetry-protected chiral edge states which transport particles unidirectionally. These same effects can be harnessed in the frequency-time domain using a spin-1/2 system subject to periodic drives [1].

Previously, the topological regime of such models was thought to be experimentally inaccessible due to a need for ultrastrong coupling; however, recent results have shown that the desired Hamiltonian is achievable in a rotating frame and can give rise to “boosting” of non-classical states of light in a cavity [2]. Here we present experimental progress toward realization of this effect using a transmon qubit in a microwave cavity.

[1] P. J. Crowley et al., Phys. Rev. B 99, 064306 (2019)

[2] D. M. Long et al., Phys. Rev. Lett. 128, 183602 (2022)