Front Cover: Optimized Design of the Lithium Niobate for Spectrally‐Pure‐State Generation at MIR Wavelengths Using Metaheuristic Algorithm (Adv. Quantum Technol. 7/2022).

In article number 2200028, Wu-Hao Cai, Ying Tian, Rui-Bo Jin, and colleagues exploit the particle swarm optimization algorithm to design lithium niobate for generating spectrally-pure single photons at mid-infrared wavelengths. Front Cover: Optimized Design of the Lithium Niobate for Spectrally-Pure-State Generation at MIR Wavelengths Using Metaheuristic Algorithm (Adv. This technique will play as a practical tailoring tool in the crystal structure design and can be utilized for designing special nonlinear crystals to generate exotic quantum states for quantum sensing and metrology. [Extracted from the article]