title: Simple all-microwave entangling gate for fixed-frequency superconducting qubits.
abstract: We demonstrate an all-microwave two-qubit gate on superconducting qubits which are fixed in frequency at optimal bias points. The gate requires no additional subcircuitry and is tunable via the amplitude of microwave irradiation on one qubit at the transition frequency of the other. We use the gate to generate entangled states with a maximal extracted concurrence of 0.88, and quantum process tomography reveals a gate fidelity of 81%.
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.forename: A D
authors.initials: AD
authors.lastname: Córcoles
authors.forename: Jay M
authors.initials: JM
authors.lastname: Gambetta
authors.forename: Chad
authors.initials: C
authors.lastname: Rigetti
authors.forename: B R
authors.initials: BR
authors.lastname: Johnson
authors.forename: John A
authors.initials: JA
authors.lastname: Smolin
authors.forename: J R
authors.initials: JR
authors.lastname: Rozen
authors.forename: George A
authors.initials: GA
authors.lastname: Keefe
authors.forename: Mary B
authors.initials: MB
authors.lastname: Rothwell
authors.forename: Mark B
authors.initials: MB
authors.lastname: Ketchen
authors.forename: M
authors.initials: M
authors.lastname: Steffen