Giant-atom-mediated photon blockade
Phys. Rev. A 114, 033734 – Published 25 September, 2026
DOI: https://doi.org/10.1103/jgmv-qt84
Abstract
Photon blockade is a phenomenon in which the presence of system nonlinearity causes the output to consist of single photons, which has been extensively studied in point-atom systems, but it has barely been explored in giant-atom ones. In this paper, we propose a giant-atom-mediated photon-blockade scheme based on two-cavity and three-cavity systems with a driving field applied to the first cavity. We show that simultaneous unconventional photon blockades (UPBs) cannot occur in the point-atom system (the atom couples only to the leftmost cavity) because a cavity with a single path always exists. In contrast, the spatially extended nature of the giant atom enables coupling to multiple cavities and allows for the introduction of a phase and coupling strength. Consequently, simultaneous UPBs in multiple cavities can be obtained due to multipath destructive interference. Moreover, by manipulating the detuning, we observe simultaneous conventional photon blockades in multiple cavities. Finally, we study simultaneous two-photon blockades in a point-atom multiple-cavity system.
