摘要
有效的量有 thetwo 步计划的安全直接通讯网络协议被使用 Einstein-Podolsky-Rosen (EPR ) 建议作为量信息搬运人配对块。服务者，说艾莉斯，在通讯和用户执行的量准备并且测量 EPR 对编码他们的消息的四本地单一的操作。合法用户的任何人能安全地在网络上传达另一一个。自从几乎所有，在这的例子，计划是有用的，每 EPR 对能带二位信息，为 qubits 的效率和两个接近的来源能力最大的价值。
An efficient quantum secure direct communication network protocol with the two-step scheme is proposed by using the Einstein-Podolsky-Rosen （EPR） pair block as the quantum information carrier. The server, say Alice, prepares and measures the EPR pairs in the quantum communication and the users perform the four local unitary operations to encode their message. Anyone of the legitimate users can communicate another one on the network securely. Since almost all of the instances in this scheme are useful and each EPR pair can carry two bits of information, the efficiency for qubits and the source capacity both approach the maximal values.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 10447106, 10435020, 10254002, A0325401 and 10374010, and Beijing Education Committee under Grant No XK100270454.
关键词
量子保密直接通信网络
二阶协议
量子信息
量子论
LOCAL UNITARY OPERATIONS
KEY DISTRIBUTION
EPR PAIRS
BELL THEOREM
GHZSTATE
CRYPTOGRAPHY
ENTANGLEMENT
SCHEME
TELEPORTATION
DIALOGUE
