4粒子团簇态的非对称可控密集编码  

Controlled Dense Coding Using Non-symmetric Channel via Four Particle-cluster State

作　　者：臧鹏[1] 宋孜跃 兰翠翠 刘幸[1] ZANG Peng;SONG Zi-yue;LAN Cui-cui;LIU Xing(Radar NCO School,Air Force Early Warning Academy,Wuhan 430345,China)

机构地区：[1]空军预警学院雷达士官学校,湖北武汉430345

出　　处：《量子光学学报》2023年第4期55-61,共7页Journal of Quantum Optics

基　　金：国家自然科学基金(12101450)。

摘　　要：为了利用相同的资源传递更多的信息,提出一种非对称可控密集编码方案,非对称信道为5×2×2×2维的4粒子团簇态。方案有两个控制者,一个控制者对粒子进行正交基测量,通过控制测量角来控制信道的纠缠度;另一个控制者进行投影测量,作用是通过测量产生密集编码的量子信道,同时也可以控制编码传输能否进行。信道产生后,通过发送者的提纯、编码操作和接收者的测量操作,实现可控密集编码。传输的平均信息量为4×(1+log_(2)5)|α|^(2)。方案还将基于4粒子团簇态的可控非对称编码扩展到N×2×2×2维非对称信道,证明了非对称编码具有很强的扩展性。研究发现,非对称编码的信息量随信道非对称程度的提高而增大。In order to improve the security and economy of information transmission,this paper proposes a controllable dense coding scheme using 4-particle cluster states as quantum channels,and a 5×2×2×2-dimensional asymmetric coding channel.In this scheme,the control party is changed from one to two,and the safety is higher.The asymmetric encoding method can transmit more information.The operation of the control side is one-dimensional orthogonal base measurement and projection measurement,which is easier to realize.The selected quantum channel is a 4-particle cluster state,which has continuous entanglement and maximum connectivity compared with the GHZ state and W state,and is more suitable for quantum channel.Alice,Bob,Charlie and Daniel share a 4-particle cluster state,where particle 1 is a 5-level particle and particles 2,3 and 4 are 2-level particles.Charlie and Daniel are the controlling parties.If agree to the code transfer between Alice and Bob,Charlie will carry out orthogonal basis measurement of the particles in hand and control the entanglement degree of the channel by controlling the measurement Angle.Daniel makes projective measurements of the particles in hand to generate a quantum channel of dense coding through measurement,while also controls whether the encoded transmission is conducted.After measuring,tell Alice and Bob the results.Alice introduces auxiliary particle a to purify the entangled state.After the purification is successful,Alice performs a coded operation on the hand,a total of ten specific operations.After the operation is complete,Alice sends the particle to Bob.After receiving the particles sent by Alice,Bob makes a joint measurement of the particles under this set of orthogonal complete bases.The average information content of the successful intensive encoding scheme is 4×(1+log_(2)5)|α|^(2).Through the research,it is found that the controller Charlie can control the entanglement degree of the quantum channel between Alice and Bob by controlling the measurement Angle,and the adjustm

关 键 词：量子信息 可控密集编码 非对称信道 幺正变换 4粒子团簇态 

分 类 号：O431[机械工程—光学工程]