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Physical Review A

Nonreciprocal universal photon blockade in a chiral cavity system based on the two-photon Jaynes-Cummings model

Mingyang Cheng, Haiwen Jiang, Yang Ding, Xiangying Hao, 丁春玲

Published Oct 19, 2026• 0 citations
Publisher
DOI
10.1103/cjlb-zsxj

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Two-photon blockade in an atom-cavity system with two-photon Jaynes–Cummings coupling

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In this paper, the two-photon blockade effect in an atom-cavity system, by two-photon Jaynes–Cummings coupling, has been studied. In this hybrid system, that is, a three-wave-mixing system with an atom, by means of analytical calculations and numerical simulations, we show that the two-photon blockade effect can be realized. The presence of an atom by two-photon Jaynes–Cummings coupling could make the blockade effect much stronger than that in a three-wave-mixing system. Furthermore, the increase in two-photon Jaynes–Cummings coupling strength could further enhance the blockade effect. All of these may provide useful references for future experimental or application studies of two-photon sources or devices.

Journal of Modern Optics•May 6, 2026•0 citations
We introduce a method to achieve nonreciprocal photon blockade in an optical resonator that is chirally coupled to a two-level atom. This approach enables single-excitation and two-excitation resonant conditions to be simultaneously satisfied. The atom-uncoupled optical mode can be blocked with eliminating its two-photon excitation by judiciously selecting parameters, e.g., the optical coupling strength. The chiral interaction between the resonator mode and the atom leads to different optimal parameter conditions for generating photon blockade in the two opposite drivings. This offers a natural way to realize nonreciprocal photon blockade. The nonreciprocity achieved by the chiral cavity-atom interaction diminishes the experimental difficulty by eliminating the need to rotate the resonator. The blockade mode achieves very high purity of single-photon excitation, as characterized by a second-order correlation function of ${g}^{(2)}(0)\ensuremath{\sim}{10}^{\ensuremath{-}4}$. In particular, in the nonreciprocal regime, the mean number of photons is significantly higher where photon blockade occurs compared to the general Jaynes-Cummings case. Our findings are particularly relevant for the development of quantum nonreciprocal devices and their applications in quantum information processing, including chiral networks.
ABSTRACT High‐performance unidirectional and directional single‐photon sources characterized by high purity and brightness are crucial in quantum networks. In this work, photon blockade has been demonstrated with maximized mean photon number in the emitter, cavity and two‐field driving Jaynes–Cummings models using two‐photon dissipation. The results show that the two‐photon dissipation process effectively enhance the antibunching effect, thereby reducing the necessity for sufficiently strong coupling strengths and enabling the realization of photon blockade at points of maximized mean photon number. Based on prior study, nonreciprocal photon blockade via chiral coupling is proposed in conjunction with two‐photon dissipation under different driving configurations. The results indicate that nonreciprocal photon blockade emerges in both cavity and two‐field driving cases, but is absent in the emitter driving case. Under cavity driving, the nonreciprocal photon blockade accompanies with relatively higher mean photon number. Under two‐field driving, additional advantages are observed. First, the nonreciprocal photon blockade can be obtained independently in both driving directions. Second, the effect is stronger compared to that under cavity driving. Third, it operates effectively over relatively broader continuous frequency ranges. This work is meaningful for the development of high‐performance single‐photon sources and nonreciprocal single‐photon devices in simple cavity quantum electrodynamics systems.
In this paper, the two-photon blockade effect in an atom-cavity system, by two-photon Jaynes–Cummings coupling, has been studied. In this hybrid system, that is, a three-wave-mixing system with an atom, by means of analytical calculations and numerical simulations, we show that the two-photon blockade effect can be realized. The presence of an atom by two-photon Jaynes–Cummings coupling could make the blockade effect much stronger than that in a three-wave-mixing system. Furthermore, the increase in two-photon Jaynes–Cummings coupling strength could further enhance the blockade effect. All of these may provide useful references for future experimental or application studies of two-photon sources or devices.