Title
Restless Tuneup of High-Fidelity Qubit Gates
Author
Rol, M.A.
Bultink, C.C.
O'Brien, T.E.
de Jong, S.R.
Theis, L.S.
Fu, X.
Luthi, F.
Vermeulen, R.F.L.
de Sterke, J.C.
Bruno, A.
Deurloo, D.
Schouten, R.N.
Wilhelm, F.K.
Dicarlo, L.
Publication year
2017
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
Observation, Weapon & Protection Systems
RT - Radar Technology
TS - Technical Sciences
High Tech Systems & Materials
Industrial Innovation
To reference this document use:
http://resolver.tudelft.nl/uuid:562a25d9-50ad-48ae-a8de-b717025a7e05
TNO identifier
762771
Publisher
American Physical Society
ISSN
2331-7019
Source
Physical Review Applied, 7 (4)
Article number
041001
Document type
article