Programme

P.52 -- Posters, VCTP-51

Date: Thursday, 6 August 2026

Time: 09:30 - 10:30

Photon blockade in a system of two micro-cavities with nonlinear coupling kicked by periodic laser pulses

Le Duc Vinh (1,2), Tran Cong Phong (1,2)

(1) Atomic Molecular and Optical Physics Research Group, Institute for Advanced Study in Technology, Ton Duc Thang University, Ho Chi Minh City, Vietnam. (2) Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam.

We systematically investigate the quantum statistical properties and the mechanism crossover between conventional and unconventional photon blockade (CPB and UPB) in two nonlinearly coupled micro-cavities driven by periodic laser pulses. Using analytical derivations and numerical simulations, we map the quantum phase profile over the driving detuning , nonlinear coefficient χ, and linear inter-cavity coupling strength β, all scaled by the cavity decay rate γ. In the strong nonlinearity regime (χ/γ>>1), robust CPB occurs via energy-level anharmonicity. In the weak nonlinearity regime (χ/γ<<1), UPB dominates through multi-path destructive interference within highly localized parameter regions. Crucially, the (β/γ,χ/γ) phase diagrams reveal a distinct boundary where the photon blockade completely collapses because the rising nonlinearity dismantles UPB phase-matching before CPB can be established. Furthermore, strong linear coupling induces normal-mode splitting, dynamically shifting blockade valleys and enabling multiphoton transitions to generate extreme super-bunching. This pulse-kicked system offers high tunability without requiring giant natural nonlinear materials, providing a feasible roadmap for high-performance quantum devices in scalable networks.

Presenter: Le Duc Vinh