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Researchers studied multiparticle correlations in mesoscopic scattering, focusing on boson sampling, the birthday paradox, and Hong-Ou-Mandel profiles. They used a semiclassical calculation to determine transmission probabilities through mesoscopic cavities for noninteracting particles, finding universal forms for the first two moments of transmission probabilities. The study showed that mesoscopic chaotic scattering of Bose-Einstein condensates could be used to build a boson sampler and observe the macroscopic Hong-Ou-Mandel effect. The researchers also found that the bosonic birthday paradox drives a quantum-classical transition, and they provided a mesoscopic approach to this phenomenon. Their methods can be extended to the optical case, making a connection with recent experiments.