Computer-automated tuning procedures for semiconductor quantum dot arrays

Mills, A. R.; Feldman, M. M.; Monical, C.; Lewis, P. J.; Larson, K. W.; Mounce, A. M.; Petta, J. R.

doi:10.1063/1.5121444

Computer-automated tuning procedures for semiconductor quantum dot arrays

Journal Article · Mon Sep 09 00:00:00 EDT 2019 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5121444· OSTI ID:1667436

Mills, A. R. ^[1]; Feldman, M. M. ^[1]; Monical, C. ^[2]; Lewis, P. J. ^[2]; Larson, K. W. ^[2]; Mounce, A. M. ^[2]; ^[1]

Princeton Univ., NJ (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

As with any quantum computing platform, semiconductor quantum dot devices require sophisticated hardware and controls for operation. The increasing complexity of quantum dot devices necessitates the advancement of automated control software and image recognition techniques for rapidly evaluating charge stability diagrams. We use an image analysis toolbox developed in Python to automate the calibration of virtual gates, a process that previously involved a large amount of user intervention. Moreover, we show that straightforward feedback protocols can be used to simultaneously tune multiple tunnel couplings in a triple quantum dot in a computer automated fashion. Finally, we adopt the use of a “tunnel coupling lever arm” to model the interdot barrier gate response and discuss how it can be used to more rapidly tune interdot tunnel couplings to the gigahertz values that are compatible with exchange gates.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); Gordon and Betty Moore Foundation; US Army Research Office (ARO)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1667436

Alternate ID(s):: OSTI ID: 1560783

Report Number(s):: SAND--2020-9961J; 690745

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 11 Vol. 115; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Effects of interface steps on the valley-orbit coupling in a Si/SiGe quantum dot Tariq, Bilal; Hu, Xuedong Physical Review B, Vol. 100, Issue 12 https://doi.org/10.1103/physrevb.100.125309	journal	September 2019
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