Restless Tuneup of High-Fidelity Qubit Gates
article
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.
TNO Identifier
762771
ISSN
23317019
Source
Physical Review Applied, 7(4)
Publisher
American Physical Society
Article nr.
041001
Files
To receive the publication files, please send an e-mail request to TNO Repository.