退相位环境下Werner态在石墨烯基量子通道中的隐形传输  

Teleportation of Werner state via graphene-based quantum channels under dephasing environment

作　　者：张乐 袁训锋 谭小东 Zhang Le;Yuan Xun-Feng;Tan Xiao-Dong(School of Electronic Information and Electrical Engineering,Shangluo University,Shangluo 726000,China)

机构地区：[1]商洛学院电子信息与电气工程学院,商洛726000

出　　处：《物理学报》2022年第7期44-53,共10页Acta Physica Sinica

基　　金：陕西省自然科学基础研究计划项目(批准号:2021JQ-837);国家自然科学基金(批准号:11847042);商洛学院科学与技术研究项目(批准号:19SKY025);商洛市科技局创新团队(批准号:SK2017-46)资助的课题。

摘　　要：基于有效低能理论,研究了退相位环境下Werner态在石墨烯基量子通道中的隐形传输.结果表明,输出态纠缠度总是随着输入态纠缠度的增大而增大,而相应的保真度却正好相反;对于给定的输入态,量子通道中的纠缠越大,输出态的品质就越高.对于石墨烯基量子通道,低温和弱库仑排斥势可以减缓其纠缠资源在退相位环境中的衰减,且温度低于40 K,电子间库仑排斥势小于6 eV时,输出态的平均保真度可以达到80%以上.这就说明石墨烯材料在量子信息领域中具有潜在的应用价值.The teleportation of Werner state in the graphene-based quantum channels under the dephasing environment is studied through the effective low-energy theory in this paper.The results show that the output entanglement normally reaches a higher level as the input entanglement increases,while the performance of the corresponding fidelity is opposite.Given the input state,the greater entanglement in the quantum channel can provide the higher-quality output state.For graphene-based quantum channels,the low temperature and weak Coulomb repulsive potential can decelerate the attenuation of entanglement resources in the dephasing environment.Moreover,when the temperature is lower than 40 K and the coulomb repulsive potential between electrons is less than 6 eV,the average fidelity of the output state reaches more than 80%.These results indicate that graphene has potential applications in quantum information.

关 键 词：石墨烯纳米带 Werner态 量子隐形传态 退相位 

分 类 号：O413[理学—理论物理] TQ127.11[理学—物理]