高阶Bessel无衍射光束具有轨道角动量,并且是在自由空间中传播时一定范围内横向强度分布保持不变的单色光场,光场中的每个光子都具有确定的轨道角动量lh,在每一本征模中由光量子携带的角动量数由拓扑荷l表示,本征态|l>可被用于多维量子纠缠.基于高阶Bessel光束,提出一种利用具轨道角动量光子正交态作为信息载体实现光通信的方法,每光子携带有确定的轨道角动量态,可以提高通信协议的密钥生成效率,也为增加光通信距离提供一种量子解决方案.
The nondiffracting higher-order Bessel beams carry the orbital angular momentum OAM).During free propagation, their transverse intensity profile remains nearly invariant in a range. The beam comprises the topological charge l helical phasefronts and carries an orbital angular momentum of lh per photon. The angular momentum number carried by the photon in each eigenmode is represented by l,and the eigenstates ｜l> can generate multidimensional quantum entangled states. A method of optical communication is presented that encodes information in two orthogonal orbital angular momentum states based on higher-order Bessel beams. Each photon carries OAM states of information, which can increase the key generation rate of the protocol, and offer a quantum solution for increase of the optical communication distance.
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