关键词: 轨道角动量, 量子通信, 编码, 光通信, orbital angular momentum, quantum communication, data coding, optical communication

Abstract: The nondiffractingv higher-order Bessel beams carry the orbital angular momentum.During free propagation, their transverse intensity profile remains nearly invariant in a range.The beam comprising the topological charge helical phasefronts and carries an orbital angular momentum of per photon.The angular momentum number carried by the photon in each eigenmode is represented by ,and the eigenstates can generate multidimensional quantum entangled states. This paper presented a method of optical communication that encodes information in two orthogonal orbital angular momentum states based on higher-order Bessel beams.Each photon carreis OAM states of information,can increasing the key ganeration rate of the protocol,and offers a quantum solution for increase the optical communication distance.