Print Email Facebook Twitter Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits Title Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits Author Rol, M.A. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Battistel, F. (TU Delft QCD/Terhal Group; TU Delft QuTech Advanced Research Centre) Malinowski, F.K. (TU Delft QRD/Kouwenhoven Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Bultink, C.C. (TU Delft ALG/General; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Tarasinski, B.M. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Vollmer, R. (Kavli institute of nanoscience Delft; Student TU Delft) Haider, S.N. (TU Delft Business Development; TU Delft QuTech Advanced Research Centre; TNO) Muthusubramanian, N. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Bruno, A. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Terhal, B.M. (TU Delft QCD/Terhal Group; TU Delft Quantum Computing; TU Delft QuTech Advanced Research Centre; Forschungszentrum Jülich GmbH) DiCarlo, L. (TU Delft QCD/DiCarlo Lab; TU Delft QN/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Department Business Development Date 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. Subject quantum benchmarkingquantum controlquantum gatessuperconducting qubits To reference this document use: http://resolver.tudelft.nl/uuid:827a9922-315d-48b8-933e-2ca299eaedf5 DOI https://doi.org/10.1103/PhysRevLett.123.120502 ISSN 0031-9007 Source Physical Review Letters, 123 (12) Part of collection Institutional Repository Document type journal article Rights © 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 Files PDF PhysRevLett.123.120502.pdf 1.2 MB Close viewer /islandora/object/uuid:827a9922-315d-48b8-933e-2ca299eaedf5/datastream/OBJ/view