Print Email Facebook Twitter Restless Tuneup of High-Fidelity Qubit Gates Title Restless Tuneup of High-Fidelity Qubit Gates Author Rol, M.A. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Bultink, C.C. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) O'Brien, T.E. (Universiteit Leiden) De Jong, S. R. (Student TU Delft; Kavli institute of nanoscience Delft) Theis, L. S. (Saarland University) Fu, X. (TU Delft Computer Engineering) Lüthi, F. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Vermeulen, R.F.L. (TU Delft ALG/General; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) de Sterke, J.C. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Topic Embedded Systems B.V.) Bruno, A. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Deurloo, D. (TU Delft BUS/General; TU Delft QuTech Advanced Research Centre; TNO) Schouten, R.N. (TU Delft ALG/General; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Wilhelm, FK (Saarland University) DiCarlo, L. (TU Delft QCD/DiCarlo Lab; TU Delft QN/DiCarlo Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Date 2017-04-24 Abstract We present a tuneup protocol for qubit gates with tenfold speedup over traditional methods reliant on qubit initialization by energy relaxation. This speedup is achieved by constructing a cost function for Nelder-Mead optimization from real-time correlation of nondemolition measurements interleaving gate operations without pause. Applying the protocol on a transmon qubit achieves 0.999 average Clifford fidelity in one minute, as independently verified using randomized benchmarking and gate-set tomography. The adjustable sensitivity of the cost function allows the detection of fractional changes in the gate error with a nearly constant signal-to-noise ratio. The restless concept demonstrated can be readily extended to the tuneup of two-qubit gates and measurement operations. Subject Research Areas To reference this document use: http://resolver.tudelft.nl/uuid:1a29b8e6-a89c-43e1-814f-ae53b04266e4 ISSN 2331-7019 Source Physical Review Applied, 7 (4) Part of collection Institutional Repository Document type journal article Rights © 2017 M.A. Rol, C.C. Bultink, T.E. O'Brien, S. R. De Jong, L. S. Theis, X. Fu, F. Lüthi, R.F.L. Vermeulen, J.C. de Sterke, A. Bruno, D. Deurloo, R.N. Schouten, FK Wilhelm, L. DiCarlo Files PDF PhysRevApplied.7.041001_1.pdf 744.71 KB Close viewer /islandora/object/uuid:1a29b8e6-a89c-43e1-814f-ae53b04266e4/datastream/OBJ/view