文献类型：期刊文献

英文题名：Counterfactual universal quantum computation

作者：Cao, Zhu[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Control & Optimizat Chem Proc, Minist Educ, Shanghai 200237, Peoples R China;[2]Tongji Univ, Shanghai Inst Intelligent Sci & Technol, Shanghai 200092, Peoples R China

年份：2020

卷号：102

期号：5

外文期刊名：PHYSICAL REVIEW A

收录：;EI(收录号：20204909572784);WOS:【SCI-EXPANDED(收录号:WOS:000589275600003)】；

基金：This work was supported by the internal Grant No. SLH00202007 from East China University of Science and Technology.

语种：英文

外文关键词：Qubits

摘要：Universal quantum computation is usually associated with interaction among two-level quantum subsystems, as this interaction is commonly viewed as a necessity to achieve universal quantum computation. In this work we show that, contrary to this intuition, universal quantum computation can be achieved without interaction among initially independent two-level quantum subsystems. We call it counterfactual universal quantum computation. As special cases, we show how to achieve counterfactual communication of quantum states, counterfactual quantum swapping, and counterfactual quantum erasure codes. To ease practical implementation, we analyze counterfactual universal quantum computation with realistic devices, including the effects of finite execution time, photon loss, and atom missing. Besides the theoretical interest of illustrating the mysterious and counter-intuitive nature of quantum physics, our work has practical applications to color imaging of ancient arts, upon which light is forbidden to shine.