title: Characterization of a two-transmon processor with individual single-shot qubit readout.
abstract: We report the characterization of a two-qubit processor implemented with two capacitively coupled tunable superconducting qubits of the transmon type, each qubit having its own nondestructive single-shot readout. The fixed capacitive coupling yields the sqrt[iSWAP] two-qubit gate for a suitable interaction time. We reconstruct by state tomography the coherent dynamics of the two-bit register as a function of the interaction time, observe a violation of the Bell inequality by 22 standard deviations after correcting readout errors, and measure by quantum process tomography a gate fidelity of 90%.
authors.affiliation: Quantronics group, Service de Physique de l'État Condensé (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: A
authors.initials: A
authors.lastname: Dewes
authors.forename: F R
authors.initials: FR
authors.lastname: Ong
authors.forename: V
authors.initials: V
authors.lastname: Schmitt
authors.forename: R
authors.initials: R
authors.lastname: Lauro
authors.forename: N
authors.initials: N
authors.lastname: Boulant
authors.forename: P
authors.initials: P
authors.lastname: Bertet
authors.forename: D
authors.initials: D
authors.lastname: Vion
authors.forename: D
authors.initials: D
authors.lastname: Esteve