title: Experimental Demonstration of a Resonator-Induced Phase Gate in a Multiqubit Circuit-QED System.
abstract: The resonator-induced phase (RIP) gate is an all-microwave multiqubit entangling gate that allows a high degree of flexibility in qubit frequencies, making it attractive for quantum operations in large-scale architectures. We experimentally realize the RIP gate with four superconducting qubits in a three-dimensional circuit-QED architecture, demonstrating high-fidelity controlled-z (cz) gates between all possible pairs of qubits from two different 4-qubit devices in pair subspaces. These qubits are arranged within a wide range of frequency detunings, up to as large as 1.8 GHz. We further show a dynamical multiqubit refocusing scheme in order to isolate out 2-qubit interactions, and combine them to generate a 4-qubit Greenberger-Horne-Zeilinger state.
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: Hanhee
authors.initials: H
authors.lastname: Paik
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: A
authors.initials: A
authors.lastname: Mezzacapo
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: Martin
authors.initials: M
authors.lastname: Sandberg
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: D T
authors.initials: DT
authors.lastname: McClure
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: B
authors.initials: B
authors.lastname: Abdo
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: A D
authors.initials: AD
authors.lastname: Córcoles
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: O
authors.initials: O
authors.lastname: Dial
authors.affiliation: Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA.
authors.forename: D F
authors.initials: DF
authors.lastname: Bogorin
authors.affiliation: Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA.
authors.forename: B L T
authors.initials: BL
authors.lastname: Plourde
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: M
authors.initials: M
authors.lastname: Steffen
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: A W
authors.initials: AW
authors.lastname: Cross
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Gambetta
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218, USA.
authors.forename: Jerry M
authors.initials: JM
authors.lastname: Chow