Fast Bayesian Tomography of a Two-Qubit Gate Set in Silicon

T. J. Evans, W. Huang, J. Yoneda, R. Harper, T. Tanttu, K. W. Chan, F. E. Hudson, K. M. Itoh, A. Saraiva, C. H. Yang, A. S. Dzurak, S. D. Bartlett

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Benchmarking and characterizing quantum states and logic gates is essential in the development of devices for quantum computing. We introduce a Bayesian approach to self-consistent process tomography, called fast Bayesian tomography (FBT), and experimentally demonstrate its performance in characterizing a two-qubit gate set on a silicon-based spin qubit device. FBT is built on an adaptive self-consistent linearization that is robust to model approximation errors. Our method offers several advantages over other self-consistent tomographic methods. Most notably, FBT can leverage prior information from randomized benchmarking (or other characterization measurements), and can be performed in real time, providing continuously updated estimates of full process matrices while data are acquired.

Original languageEnglish
Article number024068
JournalPhysical Review Applied
Issue number2
Publication statusPublished - 2022 Feb

ASJC Scopus subject areas

  • General Physics and Astronomy


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