Work

Autonomous Estimation of High-Dimensional Coulomb Diamonds from Sparse Measurements

Year: 2022

Type: article

Abstract: In spin-based quantum processors, each quantum dot of a qubit is populated by exactly one electron, which requires careful tuning of each gate voltage such that it lies inside the charge-stability region (the ``Coulomb diamond'') associated with the dot array. However, mapping the boundary of a multidimensional Coulomb diamond by traditional dense raster scanning would take years, so the authors develop a sparse acquisition technique that autonomously learns Coulomb-diamond boundaries from a small number of measurements. Here we have hardware-triggered line searches in the gate-voltage space of a silicon quadruple dot, with smart search directions proposed by an active-learning algorithm.

Source: Physical Review Applied

DOI: 10.1103/physrevapplied.18.064040