Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits

Journal article (2019)

Authors

M.A. Rol Kavli institute of nanoscience Delft, QuTech Advanced Research Centre, QCD/DiCarlo Lab - QuTech Advanced Research Centre
F. Battistel QuTech Advanced Research Centre, QCD/Terhal Group - QuTech Advanced Research Centre
L. DiCarlo QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QCD/DiCarlo Lab - QuTech Advanced Research Centre , QN/DiCarlo Lab - AS
F.K. Malinowski Kavli institute of nanoscience Delft, QRD/Kouwenhoven Lab - QuTech Advanced Research Centre , QuTech Advanced Research Centre
C.C. Bultink ALG/General - QuTech Advanced Research Centre , QuTech Advanced Research Centre, Kavli institute of nanoscience Delft
B.M. Tarasinski QCD/DiCarlo Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft, QuTech Advanced Research Centre
R. Vollmer Student, Kavli institute of nanoscience Delft
S.N. Haider TNO, QuTech Advanced Research Centre, Business Development
N. Muthusubramanian QCD/DiCarlo Lab - QuTech Advanced Research Centre , QuTech Advanced Research Centre, Kavli institute of nanoscience Delft
A. Bruno QCD/DiCarlo Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft, QuTech Advanced Research Centre
B.M. Terhal QCD/Terhal Group - QuTech Advanced Research Centre , QCD/Terhal Group - QuTech Advanced Research Centre , Forschungszentrum Jülich, QuTech Advanced Research Centre
Research Group
QCD/DiCarlo Lab (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2019 M.A. Rol, F. Battistel, F.K. Malinowski, C.C. Bultink, B.M. Tarasinski, R. Vollmer, S.N. Haider, N. Muthusubramanian, A. Bruno, B.M. Terhal, L. DiCarlo
DOI: https://doi.org/10.1103/PhysRevLett.123.120502
More Info
expand_more

Published Date

2019

Language

English

Faculty

QuTech Advanced Research Centre

Department

Quantum Computing Division

Research Group

QCD/DiCarlo Lab

Abstract

Conditional-phase (cz) gates in transmons can be realized by flux pulsing computational states towards resonance with noncomputational ones. We present a 40 ns cz gate based on a bipolar flux pulse suppressing leakage (0.1%) by interference and approaching the speed limit set by exchange coupling. This pulse harnesses a built-in echo to enhance fidelity (99.1%) and is robust to long-timescale distortion in the flux-control line, ensuring repeatability. Numerical simulations matching experiment show that fidelity is limited by high-frequency dephasing and leakage by short-timescale distortion.