Title
Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits
Author
Rol, M.A.
Battistel, F.
Malinowski, F.K.
Bultink, C.C.
Tarasinski, B.M.
Vollmer, R.
Haider, S.N.
Muthusubramanian, N.
Bruno, A.
Terhal, B.M.
Dicarlo, L.
Publication year
2019
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. © 2019 American Physical Society.
Subject
Atomic physics
Physics
Flux control
High frequency HF
High-fidelity
Leakage interferences
Phase gates
Speed limit
Superconducting qubits
Time-scales
Qubits
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TNO identifier
869493
Publisher
American Physical Society
ISSN
0031-9007
Source
Physical Review Letters, 123 (12)
Article number
120502
Document type
article