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以一个四粒子纠缠态作为量子信道,提出了一种对称信道中的量子稠密编码方案。通信中除了包含A、B收发双方外,还加入了两个控制者C和D。A、C和D需要对自己拥有的量子位进行操作,然后把粒子传送给接收者B。B在经过一系列的量子操作、量子变换及量子测量后,会获得可以代表经典数字信息的量子态。利用这一方案,A、B之间可以实现经典数字信息0～15在量子信道中的传递。
Taking a four-particle entangled state as a quantum channel, a quantum dense coding scheme in symmetric channel is proposed. In addition to communication A, B, both sending and receiving, but also joined the two controllers C and D. A, C, and D need to manipulate the qubits they own and then send the particles to Recipient B. After a series of quantum operations, quantum transformations and quantum measurements, B obtains quantum states that represent classical digital information. With this scheme, A and B can achieve the transfer of classical digital information 0 ~ 15 in the quantum channel.