Print Email Facebook Twitter High-Fidelity Controlled- Z Gate with Maximal Intermediate Leakage Operating at the Speed Limit in a Superconducting Quantum Processor Title High-Fidelity Controlled- Z Gate with Maximal Intermediate Leakage Operating at the Speed Limit in a Superconducting Quantum Processor Author Negîrneac, V. (TU Delft BUS/Quantum Delft; Lisbon Technical University) Ali, H.A.S. (TU Delft QCD/DiCarlo Lab; Kavli institute of nanoscience Delft) Muthusubramanian, N. (TU Delft QCD/DiCarlo Lab; Kavli institute of nanoscience Delft) Battistel, F. (TU Delft QCD/Terhal Group) Sagastizabal, R.E. (TU Delft QCD/DiCarlo Lab; Kavli institute of nanoscience Delft) Moreira, M. S. (Kavli institute of nanoscience Delft) Ferreira Marques, J.M. (TU Delft QCD/DiCarlo Lab; Kavli institute of nanoscience Delft) Vlothuizen, W.J. (TU Delft BUS/TNO STAFF; TNO) Beekman, M.C. (TU Delft BUS/TNO STAFF; TNO) Zachariadis, C. (TU Delft QCD/DiCarlo Lab; Kavli institute of nanoscience Delft) Haider, S.N. (TU Delft BUS/TNO STAFF; TNO) Bruno, A. (TU Delft QCD/DiCarlo Lab; Kavli institute of nanoscience Delft) DiCarlo, L. (TU Delft QCD/DiCarlo Lab; TU Delft QN/DiCarlo Lab; Kavli institute of nanoscience Delft) Date 2021 Abstract Simple tuneup of fast two-qubit gates is essential for the scaling of quantum processors. We introduce the sudden variant (SNZ) of the net zero scheme realizing controlled-Z (CZ) gates by flux control of transmon frequency. SNZ CZ gates realized in a multitransmon processor operate at the speed limit of transverse coupling between computational and noncomputational states by maximizing intermediate leakage. Beyond speed, the key advantage of SNZ is tuneup simplicity, owing to the regular structure of conditional phase and leakage as a function of two control parameters. SNZ is compatible with scalable schemes for quantum error correction and adaptable to generalized conditional-phase gates useful in intermediate-scale applications. To reference this document use: http://resolver.tudelft.nl/uuid:d4aed0fd-5075-4e32-bca5-33fae7e59811 DOI https://doi.org/10.1103/PhysRevLett.126.220502 ISSN 0031-9007 Source Physical Review Letters, 126 (22) Part of collection Institutional Repository Document type journal article Rights © 2021 V. Negîrneac, H.A.S. Ali, N. Muthusubramanian, F. Battistel, R.E. Sagastizabal, M. S. Moreira, J.M. Ferreira Marques, W.J. Vlothuizen, M.C. Beekman, C. Zachariadis, S.N. Haider, A. Bruno, L. DiCarlo Files PDF PhysRevLett.126.220502.pdf 1014.73 KB Close viewer /islandora/object/uuid:d4aed0fd-5075-4e32-bca5-33fae7e59811/datastream/OBJ/view