用非最大纠缠态实现三粒子部分纠缠态的量子受控传递

Controlled teleportation of a three-particle partly entangled state by non-maximally entangled particles

由于制备与传输中的环境耦合,现实中的纠缠态大部分是非最大纠缠态.在研究现有量子受控传递方案的基础上,提出了一种利用非最大纠缠态作为量子通道来几率地传输三粒子部分纠缠态的量子控制方案.在该方案中,选择量子通道中的一个粒子作为控制粒子,发送者进行一次Bell基测量和2次Hadamard门测量;控制者实施一次Hadamard门测量,并将他们的测量结果利用经典信道发给接收者;接收者根据他们的测量结果进行适当的幺正变换以及一些必要的投影测量就能得到待传的未知量子态.该方案是一种基于非最大纠缠态的几率受控的隐形传态方案,可以应用于远程量子计算、远程量子克隆、量子远程控制等.

The conventional approaches to controll quantum teleportation were based on maximally entangled quantum states. However, most of quantum states in reality were non-maximal entangled states due to environmental coupling in the preparation and transmission. A new method to controll quantum teleportation was presented by non-maximally entangled quantum channel. In the proposed approach, a non-maximally entangled 5- particle state was utilized as the quantum channel, one of the particles was selected as the controlling particle. The sender Alice makes Bell states measurement once and Hadamard measurements twice, and the controller Charlie performes an Hadamard measurement, so the receiver could get the quantum state which Alice wanted to send by performing appropriate unitary transformations determined by the sender and controller＇s measurement results transmitted via classical channel. The scheme was a controlled quantum teleportation based on non-maximally entangled state with certain probabilisity and could be applied to remote quantum computation, quantum telecloning and quantum remote control.