Optimization of a solid-state electron spin qubit using gate set tomography

Dehollain, Juan P., Muhonen, Juha T., Blume-Kohout, Robin, Rudinger, Kenneth M., Gamble, John King, Nielsen, Erik, Laucht, Arne, Simmons, Stephanie, Kalra, Rachpon, Dzurak, Andrew S. and Morello, Andrea (2016) Optimization of a solid-state electron spin qubit using gate set tomography. New Journal of Physics, 18 10: . doi:10.1088/1367-2630/18/10/103018

Author Dehollain, Juan P.
Muhonen, Juha T.
Blume-Kohout, Robin
Rudinger, Kenneth M.
Gamble, John King
Nielsen, Erik
Laucht, Arne
Simmons, Stephanie
Kalra, Rachpon
Dzurak, Andrew S.
Morello, Andrea
Title Optimization of a solid-state electron spin qubit using gate set tomography
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2016-10-01
Sub-type Article (original research)
DOI 10.1088/1367-2630/18/10/103018
Open Access Status DOI
Volume 18
Issue 10
Total pages 10
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Abstract State of the art qubit systems are reaching the gate fidelities required for scalable quantum computation architectures. Further improvements in the fidelity of quantum gates demands characterization and benchmarking protocols that are efficient, reliable and extremely accurate. Ideally, a benchmarking protocol should also provide information on how to rectify residual errors. Gate set tomography (GST) is one such protocol designed to give detailed characterization of as-built qubits. We implemented GST on a high-fidelity electron-spin qubit confined by a single 31P atom in 28Si. The results reveal systematic errors that a randomized benchmarking analysis could measure but not identify, whereas GST indicated the need for improved calibration of the length of the control pulses. After introducing this modification, we measured a new benchmark average gate fidelity of , an improvement on the previous value of . Furthermore, GST revealed high levels of non-Markovian noise in the system, which will need to be understood and addressed when the qubit is used within a fault-tolerant quantum computation scheme.
Keyword Quantum computing
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 08 May 2017, 15:57:52 EST by Rachpon Kalra on behalf of Learning and Research Services (UQ Library)