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人工巨原子三腔耦合系统的光子阻塞效应

骆俊豪 马康杰 梁焱 盛治郡 孙一丁 谭磊

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人工巨原子三腔耦合系统的光子阻塞效应

骆俊豪, 马康杰, 梁焱, 盛治郡, 孙一丁, 谭磊

Photon blockade in giant atom-coupled triple-cavity system

LUO Junhao, MA Kangjie, LIANG Yan, SHENG Zhijun, SUN Yiding, TAN Lei
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  • 本文研究了人工巨原子与三个微腔耦合系统中的光子阻塞效应.首先讨论了弱驱动腔模的情况,分析了单光子和双光子激发时系统的能级结构和跃迁路径,研究了系统中光子的统计特性.其次,考虑同时驱动人工巨原子和腔模,探讨了利用量子干涉效应进一步增强光子阻塞.研究结果表明,系统的两个腔中出现了对弱驱动具有鲁棒性的光子阻塞效应,等时二阶关联函数的值为g (2)(0)≈ 10-3.4.另外在同时驱动人工巨原子和腔模的情况下,本研究实现了最佳光子阻塞,等时二阶关联函数可达到g (2)(0)≈ 10-6.5.该研究结果可为单光子源的实验实现提供新的可行方案.
    The photon blockade effects in a system consisting of an artificial giant atom coupled to three cavities are investigated. By solving the Schrödinger equation, we have obtained the steady-state probability amplitudes of the system and derived the analytical expressions for the equal-time second-order correlation function. Based on these analytical expressions, the optimal conditions for the photon blockade under different driving conditions are derived in detail. We first examine the energy spectrum and transition pathways for the single-photon and two-photon excitations under the case of weak driving the cavity mode, and then investigate the photon statistical properties . It is demonstrated that the optimal conventional photon blockade can be achieved by selecting appropriate driving detunings, characterized by the equaltime second-order correlation function of g(2) (0) ≈ 10-3.4. Remarkably, we observe that both cavities of the system exhibit photon blockade effects robust against the weak driving. It also can be found that the photon blockade phenomenon becomes more pronounced while maintaining its robustness to the weak driving with the increase of the coupling strength between the artificial giant atom and cavities. Furthermore, we consider the case of simultaneously driving both the artificial giant atom and cavity modes. The unique multi-point coupling characteristics of the artificial giant atom provide additional transition pathways for photons, allowing us to exploit the resulting quantum interference to further enhance photon blockade. When the system satisfies both the optimal parametric conditions for the conventional and unconventional blockade effects, one cavity exhibits exceptional photon blockade with g(2) (0) ≈ 10-6.5. This research significantly relaxes the stringent parameter requirements for the experimental realization of single-photon sources and provides a theoretical support for improving their quality, which is crucial for achieving high-performance single-photon source.
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