CAJ | 학술논문

阐述了光学旋涡的物理本征态、产生与调控技术，总结了基于OAM（ Orbital Angular Momentum）调制的高维编码QKD以及OAM和自旋角动量（ Spin Angular Momentum，SAM）的制备方法．利用I类相位匹配BBO晶体经自发参量下转化获得信号光子和闲置光子OAM纠缠光子对；采用SAM和OAM自由度转换器件，将SAM转化为OAM．另外，运用空间光调制器（ Spatial Light Modulator，SLM）作为OAM纠缠态的“后选择”联合调制器，基于该单元技术提出基于OAM改进的BB84 QKD系统、SAM－OAM混合纠缠量子态的QKD系统，并提出三光子纠缠W态的制备方案．结果表明，编码信息量达log2（m＋2）比特（m为l的可取值个数），有望实现可扩容量子比特的安全通信，具有高维度、强纠缠特性与抗比特丢失能力，实验中单元技术对进一步增加量子通信信道复用能力和改善网络安全性具有十分重要的意义．
천술료광학선와적물리본정태、산생여조공기술，총결료기우OAM（ Orbital Angular Momentum）조제적고유편마QKD이급OAM화자선각동량（ Spin Angular Momentum，SAM）적제비방법．이용I류상위필배BBO정체경자발삼량하전화획득신호광자화한치광자OAM규전광자대；채용SAM화OAM자유도전환기건，장SAM전화위OAM．령외，운용공간광조제기（ Spatial Light Modulator，SLM）작위OAM규전태적“후선택”연합조제기，기우해단원기술제출기우OAM개진적BB84 QKD계통、SAM－OAM혼합규전양자태적QKD계통，병제출삼광자규전W태적제비방안．결과표명，편마신식량체log2（m＋2）비특（m위l적가취치개수），유망실현가확용양자비특적안전통신，구유고유도、강규전특성여항비특주실능력，실험중단원기술대진일보증가양자통신신도복용능력화개선망락안전성구유십분중요적의의．
Optical vortices of physical eigenstates, generating and control technology and high-dimensional enco-ding QKD based on OAM ( Orbital Angular Momentum) are summarized and elaborated in this paper.The OAM and spin angular momentum ( SAM) preparation methods based on the preliminary study are summarized as fol-lows:using type-I phase matching BBO crystal with spontaneous parametric down-conversion process to obtain sig-nal and idle photon pairs entangling in OAM; using SAM and OAM freedom conversion device to transverse the SAM into OAM.How to use the spatial light modulator ( SLM) as a post-selection device of OAM entangled state to propose the improved BB84 QKD system based on OAM and the hybrid SAM-OAM entanglement QKD are dis-cussed and how to prepare W-state entangled photons is proposed.It shows that the amount of encoding information can achieve log2(m+2) bits (m is the number of possible values of l) and it is expected to achieve scalable secure communication with high dimension, strong entanglement properties and the ability of anti-bit loss.Furthermore, the experiments show that cell technology has a very important scientific significance for further increasing the quan-tum communication channel multiplexing capability and improving network security.