Pure-State Photon-Pair Source with a Long Coherence Time for Large-Scale Quantum Information Processing
Bo Li, Yu-Huai Li, Yuan Wen Cao, Juan Yin, Cheng-Zhi Peng · Physical Review Applied · 2023
This study presents an experimental technique to tackle technical obstacles in generating photon pairs in pure states with extended coherence times. Such photon sources are vital for large-scale quantum information processing. The authors successfully eliminate the frequency correlation of parametric photons using optimal filtering, which enables high-quality Hong-Ou-Mandel interference between two photon sources. This breakthrough has promising practical applications in quantum science and can facilitate engineering solutions for long-distance quantum interference.