title: Zu et al. reply:.
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: C
authors.initials: C
authors.lastname: Zu
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: Y-X
authors.initials: YX
authors.lastname: Wang
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: D-L
authors.initials: DL
authors.lastname: Deng
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: X-Y
authors.initials: XY
authors.lastname: Chang
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: K
authors.initials: K
authors.lastname: Liu
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: P-Y
authors.initials: PY
authors.lastname: Hou
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: H-X
authors.initials: HX
authors.lastname: Yang
authors.affiliation: Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: L-M
authors.initials: LM
authors.lastname: Duan