title: Universal quantum gates for hybrid system assisted by atomic ensembles embedded in double-sided optical cavities.
abstract: We propose deterministic schemes for controlled-NOT (CNOT), Toffoli, and Fredkin gates between flying photon qubits and the collective spin wave (magnon) of an atomic ensemble inside double-sided optical microcavities. All the gates can be accomplished with 100% success probability in principle and no additional qubit is required. Atomic ensemble is employed so that light-matter coupling is remarkably improved by collective enhancement. We qualified the performance of the gates and the results show that they can be faithfully constituted with current experimental techniques.
authors.affiliation: Shanxi Institute of Technology, Yangquan, Shanxi 045000, China.
authors.forename: A-Peng
authors.initials: AP
authors.lastname: Liu
authors.affiliation: School of Physics and Information Engineering, Shanxi Normal University, Linfen, Shanxi 041004, China.
authors.forename: Liu-Yong
authors.initials: LY
authors.lastname: Cheng
authors.affiliation: College of Physics and Electronics Engineering, Shanxi University, Taiyuan, Shanxi 030006, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Department of Physics, College of Science, Yanbian University, Yanji, Jilin 133002, China.
authors.forename: Shou
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Shanxi Institute of Technology, Yangquan, Shanxi 045000, China.
authors.forename: Ming-Xia
authors.initials: MX
authors.lastname: Zhao