基于W态的高效量子信息拆分方案

Efficient quantum information splitting scheme based on W states

为提高基于W态的量子通信方案的效率,提出了一种新的基于W态的量子信息拆分(QIS)方案。该方案中,秘密分发者通过局域操作将经典信息编码在量子比特上,并在分发的量子比特中随机插入非正交态粒子进行检测窃听,参与者只需进行3粒子投影测量即可恢复秘密。方案使参与者能够利用1个W态直接共享2比特经典信息,并能够抵御截获-测量、截获-重发和纠缠附加粒子攻击,安全性得以保证。该方案效率较高,理论上其量子比特效率为67%。

To improve the efficiency of quantum communication based on W states, a new scheme about Quantum Information Splitting（ QIS） based on W states was proposed. Local operation was used to encode the classic information into the qubit by dealer in this scheme. The nonorthogonal state particles were inserted to detect eavesdropping in the distribution of qubit. To recover the secret, participants only needed to perform three-particle projective measurements. One W state can transmit two bits of classical information between the participants. Moreover, the scheme can resist some attacks like interceptand-measure attack, intercept-and-resend attack and entangled ancillary particles attack to make sure of its security. The scheme has good efficiency with theoretical quantum efficiency of 67%.