多色量子纠缠态,即纠缠态各个组分的载波频率不简并,该类量子纠缠态在量子信息领域中具有重要的应用.文章中,实验制备了频率可连续调谐的双色连续变量纠缠态,其中,纠缠光束中的一束波长位于碱金属铷原子的吸收线波段(795nm),另一束位于光通信波段(1560nm).在此基础上,利用饱和吸收光谱技术观测了铷原子D1线的超精细跃迁谱线,实现了双色纠缠光场到铷原子D1线的超精细跃迁线的精确调谐.
Multi-color quantum entangled states,which have nondegenerate carrier frequencies for each par- ty,will play a key role in the field of quantum communication. We demonstrated the experimental genera- tion of continuously tunable two-color continuous variable quantum entangled states. The wavelength of one beam of the entangled states lies in the absorption line of rubidium atoms (795 nm) ,and the other one lies in the telecom band (1 560 nm). Furthermore,we successfully observed the hyperfine transitions of ru- bidium D1 line based on saturated absorption spectroscopy.