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

Journal Article (2019)
Author(s)

M. A. Rol (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab, Kavli institute of nanoscience Delft)

F. Battistel (TU Delft - QCD/Terhal Group, TU Delft - QuTech Advanced Research Centre)

F. K. Malinowski (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

C. C. Bultink (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - ALG/General)

B.M. Tarasinski (TU Delft - QCD/DiCarlo Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

R. Vollmer (Student TU Delft, Kavli institute of nanoscience Delft)

N Haider (TU Delft - QuTech Advanced Research Centre, TU Delft - Business Development, TNO)

N. Muthusubramanian (TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

Alessandro Bruno (TU Delft - QCD/DiCarlo Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

Barbara Terhal (TU Delft - QCD/Terhal Group, Forschungszentrum Jülich, TU Delft - QuTech Advanced Research Centre, TU Delft - Quantum Computing)

Leonardo di Carlo (TU Delft - QCD/DiCarlo Lab, TU Delft - QN/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

Research Group
QCD/DiCarlo Lab
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 related publication
https://doi.org/10.1103/PhysRevLett.123.120502
More Info
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Publication Year
2019
Language
English
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
Research Group
QCD/DiCarlo Lab
Issue number
12
Volume number
123
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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.