title: Fast tunable coupler for superconducting qubits.
abstract: A major challenge in the field of quantum computing is the construction of scalable qubit coupling architectures. Here, we demonstrate a novel tunable coupling circuit that allows superconducting qubits to be coupled over long distances. We show that the interqubit coupling strength can be arbitrarily tuned over nanosecond time scales within a sequence that mimics actual use in an algorithm. The coupler has a measured on/off ratio of 1000. The design is self-contained and physically separate from the qubits, allowing the coupler to be used as a module to connect a variety of elements such as qubits, resonators, amplifiers, and readout circuitry over distances much larger than nearest-neighbor. Such design flexibility is likely to be useful for a scalable quantum computer.
authors.affiliation: Department of Physics, University of California, Santa Barbara, California 93106, USA.
authors.forename: R C
authors.initials: RC
authors.lastname: Bialczak
authors.forename: M
authors.initials: M
authors.lastname: Ansmann
authors.forename: M
authors.initials: M
authors.lastname: Hofheinz
authors.forename: M
authors.initials: M
authors.lastname: Lenander
authors.forename: E
authors.initials: E
authors.lastname: Lucero
authors.forename: M
authors.initials: M
authors.lastname: Neeley
authors.forename: A D
authors.initials: AD
authors.lastname: O'Connell
authors.forename: D
authors.initials: D
authors.lastname: Sank
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: M
authors.initials: M
authors.lastname: Weides
authors.forename: J
authors.initials: J
authors.lastname: Wenner
authors.forename: T
authors.initials: T
authors.lastname: Yamamoto
authors.forename: A N
authors.initials: AN
authors.lastname: Cleland
authors.forename: J M
authors.initials: JM
authors.lastname: Martinis