关键词: 量子存储，轨道角动量，量子存储，原子系综，量子信息

Abstract: Light carrying orbital angular momentum (OAM) has many exciting applications in the studies of fun- damental quantum physics, optical manipulation and trapping of particles, astrophysics, high-precision optical measurements and optical communication both in classical and quantum elds, etc. In quantum information eld, a photon encoded with information in its OAM degrees of freedom enables networks to carry signi cantly more information and increase their capacity greatly due to the inherent in nite degrees of freedom for OAM. In order to realize a long-distance quantum communication, quantum repeaters have to be used to overcome the problem of communication delity decreasing exponentially with the channel length for, where, quantum memories for photons, used for storing quantum informa- tion, are key components of a quantum repeater. So far, there are many works reporting on storing quantum states encoded in for example degree of polarization, path, time bin, etc, however, there have been very few works realizing the storage of OAM states. During the past years, our group has been focusing on the experimental realization of quantum memories for OAM states. In this review, after brie y introducing the main benchmarks for quantum memories, we will show a series of im- portant progresses achieved along this research direction in our group, including the storage of OAM qubit and qutrit, of OAM entanglement in a two-dimensional and a high-dimensional space, of hyper- entanglement and hybrid entanglement consisting of OAM and other degree of freedom. We believe that all results are very promising for realizing a high-dimensional quantum network in the future.

Key words: quantum stor