Autonomous Estimation of High-Dimensional Coulomb Diamonds from Sparse Measurements

Anasua Chatterjee, Fabio Ansaloni, Torbjorn Rasmussen, Bertram Brovang, Federico Fedele, Heorhii Bohuslavskyi, Oswin Krause, Ferdinand Kuemmeth*

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

7 Citationer (Scopus)
19 Downloads (Pure)

Abstract

Quantum dot arrays possess ground states governed by Coulomb energies, utilized prominently by singly occupied quantum dots, each implementing a spin qubit. For such quantum processors, the con-trolled transitions between ground states are of operational significance, as these allow the control of quantum information within the array such as qubit initialization and entangling gates. For few-dot arrays, ground states are traditionally mapped out by performing dense raster-scan measurements in control -voltage space. These become impractical for larger arrays due to the large number of measurements needed to sample the high-dimensional gate-voltage hypercube and the comparatively little information extracted. We develop a hardware-triggered detection method based on reflectometry, to acquire measure-ments directly corresponding to transitions between ground states. These measurements are distributed sparsely within the high-dimensional voltage space by executing line searches proposed by a learning algorithm. Our autonomous software-hardware algorithm accurately estimates the polytope of Coulomb blockade boundaries, experimentally demonstrated in a 2 x 2 array of silicon quantum dots.

OriginalsprogEngelsk
Artikelnummer064040
TidsskriftPhysical Review Applied
Vol/bind18
Udgave nummer6
Antal sider10
ISSN2331-7019
DOI
StatusUdgivet - 14 dec. 2022

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