title: Demonstration of Weight-Four Parity Measurements in the Surface Code Architecture.
abstract: We present parity measurements on a five-qubit lattice with connectivity amenable to the surface code quantum error correction architecture. Using all-microwave controls of superconducting qubits coupled via resonators, we encode the parities of four data qubit states in either the X or the Z basis. Given the connectivity of the lattice, we perform a full characterization of the static Z interactions within the set of five qubits, as well as dynamical Z interactions brought along by single- and two-qubit microwave drives. The parity measurements are significantly improved by modifying the microwave two-qubit gates to dynamically remove nonideal Z errors.
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Maika
authors.initials: M
authors.lastname: Takita
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: A D
authors.initials: AD
authors.lastname: Córcoles
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Easwar
authors.initials: E
authors.lastname: Magesan
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Baleegh
authors.initials: B
authors.lastname: Abdo
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Markus
authors.initials: M
authors.lastname: Brink
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Andrew
authors.initials: A
authors.lastname: Cross
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Jerry M
authors.initials: JM
authors.lastname: Chow
authors.affiliation: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Jay M
authors.initials: JM
authors.lastname: Gambetta