用Greenberger-Horne-Zeilinger态作量子信道实现多点控制的远程单比特幺正变换

提出了一个用三粒子纠缠的GHZ态作为量子信道实现多点控制的远程单比特幺正变换的操纵方案.在该方案中,发送者Alice能“传送”一个幺正变换给远距离的接收者Bob,此幺正变换的结构分别由Alice和Bob决定.而Alice与Bob间的量子信道宽度,亦远程单比特幺正变换的成功操纵几率则由第三者Cindy控制.Cindy与Alice（Bob）间的经典通讯也由Cindy控制.

Multicontrol Remote Single Qubit Unitary Transformation with Greenberger-Horne-Zeilinger State

Utilizing the entanglement property of Greenberger-Horne-Zeilinger (GHZ) state, a theoretical scheme to realize multicontrol remote single qubit unitary transformation is presented. In the present scheme, one party (Alice) can perform a unitary transformation on remote quantum system (Bob), in which the full structure of the unitary transformation is in a sense split and controlled locally by the two parties. By adjusting the measurement basis, the third (Cindy) can modulate the entanglement between Alice and Bob to control the probability of successful implementation. The communication between Cindy and Alice (Bob) is also controlled by Cindy in quantum way.