量子网络中部分未知量子运算的远程实施

Remote Implementation of Partially Unknown Quantum Operations in Quantum Networks

为了在初始没有分享纠缠的两个遥远节点之间传输部分未知量子运算,我们研究在量子多跳网络中忠实可行的量子通信的问题.利用基于Bell对的任意类型上的同时纠缠交换方法,首先讨论了三跳Bell态纠缠信道的建立,其中所有的Bell测量结果以及Bell对的类型都应独立的传送到起止节点,然后将之推广到任意多跳的情形.与序串纠缠交换相比,同时纠缠交换可以减少端到端的通信延迟.在新建的任意Bell态量子信道后,并基于两个单粒子酉运算限制集,提出了一个确定性的部分未知单量子运算之远程实施通用方案,分别给出了发送者和接收者具体局域操控的通用变换.

In order to transmit partially unknown quantum operation between two distant nodes which do not initially share entanglement channel with each other,we investigate the problem of faithful and feasible quantum communication in quantum multi-hop networks.Using the method of simultaneous entanglement swapping based on arbitrary types of Bell pair,we first discuss the establishment of three-hop Bell state entanglement channel,in which all Bell measurements and the types of Bell pair are sent to the starting and ending nodes independently.Then the work of this three-hop is extended to any one of the arbitrary multi-hops.Compared with sequential entanglement swapping,simultaneous entanglement swapping can reduce the end-to-end communication delay.After establishing the new arbitrary Bell state quantum channel,and based on the two restricted sets of single-qubit unitary operations,a deterministic and general scheme for the remote implementation of partially unknown single-qubit quantum operations is proposed,and the universal transformations of specific local manipulation for sender and receiver are given respectively.