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

M. A. Rol, F. Battistel, F. K. Malinowski, C. C. Bultink, B. M. Tarasinski, R. Vollmer, N. Haider, N. Muthusubramanian, A. Bruno, B. M. Terhal, and L. DiCarlo
Phys. Rev. Lett. 123, 120502 – Published 18 September 2019
PDFHTMLExport Citation

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 26 March 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.120502

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

M. A. Rol1,2, F. Battistel1, F. K. Malinowski1,2, C. C. Bultink1,2, B. M. Tarasinski1,2, R. Vollmer1,2, N. Haider1,3, N. Muthusubramanian1,2, A. Bruno1,2, B. M. Terhal1,4, and L. DiCarlo1,2

  • 1QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
  • 2Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
  • 3Netherlands Organisation for Applied Scientic Research (TNO), P.O. Box 96864, 2509 JG The Hague, The Netherlands
  • 4JARA Institute for Quantum Information, Forschungszentrum Juelich, D-52425 Juelich, Germany

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 123, Iss. 12 — 20 September 2019

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×