双模最小关联混合态作为量子信道实现量子隐形传态的保真度

基于Braunstein和Kimble提出的B-K方案以双模最小关联混合态作为量子信道实施对未知量子态的隐形传送，并以传送相干态为例进行了研究.结果表明：双模最小关联混合态作为一种广义的Einstein-Podolsky-Rosen型纠缠态在实现量子隐形传态中能很好地担当量子信道的角色，在纠缠度和压缩度选择适当的条件下被传送未知量子态的保真度可以达到1.这是比双模压缩真空态更优越的量子信道. 关键词： 量子隐形传态 双模最小关联混合态 保真度

Fidelity of the scheme of continunous variables quantum teleportation via minimum-correlation mixed quantum states

Based on the proposal of Braunstein and Kimble,we studied the continuous variables quantum teleportation via minimum-correlation mixed state.The results show that the mixed entangled state as a generalized type of Einstein-Podolsky-Rosen entangled states is a good quantum channel.As an example,we analyzed in detail teleporting a coherent state by means of this channel.When the parameters of minimum-correlation mixed state are chosen properly,the fidelity will almost reach to unity.The minimum-correlation mixed state as a quantum channel is better than the two-mode squeezed vacuum state.