title: Quantum controlled-phase-flip gate between a flying optical photon and a Rydberg atomic ensemble.
abstract: Quantum controlled-phase-flip (CPF) gate between a flying photon qubit and a stationary atomic qubit could allow the linking of distant computational nodes in a quantum network. Here we present a scheme to realize quantum CPF gate between a flying optical photon and an atomic ensemble based on cavity input-output process and Rydberg blockade. When a flying single-photon pulse is reflected off the cavity containing a Rydberg atomic ensemble, the dark resonance and Rydberg blockade induce a conditional phase shift for the photon pulse, thus we can achieve the CPF gate between the photon and the atomic ensemble. Assisted by Rydberg blockade interaction, our scheme works in the N-atoms strong-coupling regime and significantly relaxes the requirement of strong coupling of single atom to photon in the optical cavity.
authors.affiliation: Department of Physics, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Y M
authors.initials: YM
authors.lastname: Hao
authors.affiliation: Department of Physics, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: G W
authors.initials: GW
authors.lastname: Lin
authors.affiliation: ARC Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.
authors.forename: Keyu
authors.initials: K
authors.lastname: Xia
authors.affiliation: College of Physics and Energy, Fujian Normal University, Fuzhou 350108, China.
authors.forename: X M
authors.initials: XM
authors.lastname: Lin
authors.affiliation: Department of Physics, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Y P
authors.initials: YP
authors.lastname: Niu
authors.affiliation: Department of Physics, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: S Q
authors.initials: SQ
authors.lastname: Gong