"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates" "uuid:1a29b8e6-a89c-43e1-814f-ae53b04266e4","http://resolver.tudelft.nl/uuid:1a29b8e6-a89c-43e1-814f-ae53b04266e4","Restless Tuneup of High-Fidelity Qubit Gates","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)","","2017","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.","Research Areas","en","journal article","","","","","","","","","","","QCD/DiCarlo Lab","","",""