提出一种新型的基于三粒子3×2×2 维非对称纠缠量子信道可控密集编码方案。控制者(Charlie)对其手中2维粒子进行局域测量控制信 息发送者(Alice)和接收者(Bob)量子态塌缩,调控Alice和Bob量子态纠缠,实现Alice和Bob 3×2 维非对称量子信道纠缠调控。计算了Alice和Bob非对称密集编码平均信息传送量。分析表明, Charlie通过调节测量角θ 的大小可以控制Alice和Bob平均信息传送量。利用三粒子最大纠缠程度的3×2×2 维非对称纠缠量子信道, Charlie可以控制Alice和Bob密集编码传送信息量高于2比特,方案是高效的; 对于非最大纠缠程度的量子信道,传送信息量受到Charlie测量角θ 和三粒子量子态纠缠系数β共同调控。

A scheme of controlled dense coding was proposed by using non-symmetric quantum channel in 3×2×2 dimensional entangled state. The collapse of the state and entanglement between Alice and Bob were controlled by Charlie’s local measurement on his particle in two dimension. Then the 3×2 dimensional non-symmetric quantum channel was controlled. It can be seen that the average amount of transmitted information of dense coding was controlled by Charlie’s measurement angle. One can find that the average amount of information is more than 2 bits by using maximally entangled state in the non-symmetric quantum channel. Thus, this scheme is high-efficiency. In the case the entanglement is non-maximally, the transmitted information is determined by the measurement angle θ and the coefficient β of the entangled state.