Tripartite interaction-regulated tunable multi-photon blockades and antibunched emissions of single/pair multi-photon bundles in a single Josephson-photonics device

We propose a practical scheme to realize tunable multi-photon blockades and antibunched emissions of single and paired multi-photon bundles in a single Josephson-photonics device, consisting of a voltage-biased Josephson junction, a superconducting qubit and two nondegenerate microwave resonators. Under multi-photon resonance conditions, Cooper-pair tunneling is effectively modulated by the two-level qubit, inducing various multi-photon tripartite interactions among the three subsystems and enabling tunable multi-photon blockades. With engineered dissipation introduced, the device produces antibunched single multi-photon bundles from one resonator as well as correlated paired bundles from both resonators. By extending generalized second-order correlation functions to characterize paired-bundle emissions, we show via numerical simulations that both single and paired multi-photon bundles exhibit strong antibunching and high interbundle correlations. This work provides a promising experimental pathway toward constructing tunable multi-photon blockades and nonclassical multi-photon-bundle sources, with potential applications in quantum information processing and fundamental research on multi-photon multipartite interactions.