This paper proposes a quantum fingerprinting protocol using coherent states and channel multiplexing with simultaneous detection of signals across multiple channels. The protocol significantly reduces communication time and the amount of communication compared to existing coherent quantum fingerprinting protocols, even surpassing classical limits without needing expensive superconducting-nanowire single photon detectors. A proof-of-concept experiment with six wavelength channels validates the protocol's advantages, demonstrating superior performance over both classical and existing coherent quantum fingerprinting protocols.

Xiaoqing Zhong, Feihu Xu, Hoi-Kwong Lo, Li Qian