Topological anomalous Floquet photon pump
Phys. Rev. B 113, 245103 – Published 1 June, 2026
DOI: https://doi.org/10.1103/dhxg-zw1p
Abstract
There is a close theoretical connection between topological Floquet physics and cavity quantum electrodynamics (QED), yet this connection has not been realized experimentally due to complicated cavity QED models that often arise. We propose a simple, experimentally viable protocol to realize nonadiabatic topological photon pumping mediated by a single qubit, which we dub the anomalous Floquet photon pump. For both quantized photons and external drive, the system exhibits a nontrivial topological phase across a broad range of parameter space. Transitions out of the topological phase result from frequency-space delocalization. Finally, we argue that the protocol can be implemented in existing experiments via driven qubit nonlinearities, with topological pumping witnessed in reconstruction of the cavity Wigner distribution functions.
