Generating six pairs of bandwidth-expanded entangled sideband modes via time delay compensation
Shaoping Shi, Yimiao Wu, Li Gao, Li-ang Zheng, Long Tian, Yajun Wang, Wei Li, Yaohui Zheng · Optics Letters · 2023
Quantum entanglement is an important pillar of quantum information processing. In addition to the entanglement degree, the bandwidth of entangled states becomes another focus of quantum communication. Here, by virtue of a broadband frequency-dependent beam splitter, we experimentally demonstrate six pairs of independent entangled sideband modes with maximum entanglement degree of 8.1 dB. Utilizing a time delay compensation scheme, the bandwidth of independent entangled sideband modes is expanded to dozens of megahertz. This work provides a valuable resource to implement efficient quantum information processing.