title: Reduced Sensitivity to Charge Noise in Semiconductor Spin Qubits via Symmetric Operation.
abstract: We demonstrate improved operation of exchange-coupled semiconductor quantum dots by substantially reducing the sensitivity of exchange operations to charge noise. The method involves biasing a double dot symmetrically between the charge-state anticrossings, where the derivative of the exchange energy with respect to gate voltages is minimized. Exchange remains highly tunable by adjusting the tunnel coupling. We find that this method reduces the dephasing effect of charge noise by more than a factor of 5 in comparison to operation near a charge-state anticrossing, increasing the number of observable exchange oscillations in our qubit by a similar factor. Performance also improves with exchange rate, favoring fast quantum operations.
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Reed
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: B M
authors.initials: BM
authors.lastname: Maune
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: Andrews
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Borselli
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: K
authors.initials: K
authors.lastname: Eng
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: M P
authors.initials: MP
authors.lastname: Jura
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Kiselev
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: T D
authors.initials: TD
authors.lastname: Ladd
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: S T
authors.initials: ST
authors.lastname: Merkel
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: I
authors.initials: I
authors.lastname: Milosavljevic
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: E J
authors.initials: EJ
authors.lastname: Pritchett
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: M T
authors.initials: MT
authors.lastname: Rakher
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: R S
authors.initials: RS
authors.lastname: Ross
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: A E
authors.initials: AE
authors.lastname: Schmitz
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: A
authors.initials: A
authors.lastname: Smith
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Wright
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: M F
authors.initials: MF
authors.lastname: Gyure
authors.affiliation: HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: A T
authors.initials: AT
authors.lastname: Hunter