Characterizing non-Markovian Quantum Process by Fast Bayesian Tomography

• URL: http://arxiv.org/abs/2307.12452v2
• Date: Wed, 4 Oct 2023 07:58:50 GMT
• Title: Characterizing non-Markovian Quantum Process by Fast Bayesian Tomography
• Authors: R. Y. Su, J. Y. Huang, N. Dumoulin. Stuyck, M. K. Feng, W. Gilbert, T. J. Evans, W. H. Lim, F. E. Hudson, K. W. Chan, W. Huang, Kohei M. Itoh, R. Harper, S. D. Bartlett, C. H. Yang, A. Laucht, A. Saraiva, T. Tanttu and A. S. Dzurak
• Abstract summary: characterization of non-Markovian error poses a challenge to current quantum process tomography techniques. Fast Bayesian Tomography (FBT) is a self-consistent gate set tomography protocol that can be bootstrapped from earlier characterization knowledge. We introduce two experimental protocols for FBT to diagnose the non-Markovian behavior of two-qubit systems on silicon quantum dots.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: To push gate performance to levels beyond the thresholds for quantum error correction, it is important to characterize the error sources occurring on quantum gates. However, the characterization of non-Markovian error poses a challenge to current quantum process tomography techniques. Fast Bayesian Tomography (FBT) is a self-consistent gate set tomography protocol that can be bootstrapped from earlier characterization knowledge and be updated in real-time with arbitrary gate sequences. Here we demonstrate how FBT allows for the characterization of key non-Markovian error processes. We introduce two experimental protocols for FBT to diagnose the non-Markovian behavior of two-qubit systems on silicon quantum dots. To increase the efficiency and scalability of the experiment-analysis loop, we develop an online FBT software stack. To reduce experiment cost and analysis time, we also introduce a native readout method and warm boot strategy. Our results demonstrate that FBT is a useful tool for probing non-Markovian errors that can be detrimental to the ultimate realization of fault-tolerant operation on quantum computing.

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