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, L. Dicarlo

Research output: Contribution to journalArticleScientificpeer-review

63 Citations (Scopus)
332 Downloads (Pure)

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.

Original languageEnglish
Article number120502
Number of pages6
JournalPhysical Review Letters
Volume123
Issue number12
DOIs
Publication statusPublished - 2019

Keywords

  • quantum benchmarking
  • quantum control
  • quantum gates
  • superconducting qubits

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