title: Demonstrating a driven reset protocol for a superconducting qubit.
abstract: Qubit reset is crucial at the start of and during quantum information algorithms. We present the experimental demonstration of a practical method to force qubits into their ground state, based on driving appropriate qubit and cavity transitions. Our protocol, called the double drive reset of population, is tested on a superconducting transmon qubit in a three-dimensional cavity. Using a new method for measuring population, we show that we can prepare the ground state with a fidelity of at least 99.5% in less than 3 μs; faster times and higher fidelity are predicted upon parameter optimization.
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.
authors.forename: K
authors.initials: K
authors.lastname: Geerlings
authors.affiliation: INRIA Paris-Rocquencourt, Domaine de Voluceau, B.P. 105, 78153 Le Chesnay cedex, France.
authors.forename: Z
authors.initials: Z
authors.lastname: Leghtas
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.
authors.forename: I M
authors.initials: IM
authors.lastname: Pop
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.
authors.forename: S
authors.initials: S
authors.lastname: Shankar
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.
authors.forename: L
authors.initials: L
authors.lastname: Frunzio
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Schoelkopf
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA and INRIA Paris-Rocquencourt, Domaine de Voluceau, B.P. 105, 78153 Le Chesnay cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Mirrahimi
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.
authors.forename: M H
authors.initials: MH
authors.lastname: Devoret