A Three-Dimensional Array of Quantum Dots

• URL: http://arxiv.org/abs/2512.01634v1
• Date: Mon, 01 Dec 2025 13:04:02 GMT
• Title: A Three-Dimensional Array of Quantum Dots
• Authors: Hanifa Tidjani, Dario Denora, Michael Chan, Jann Hinnerk Ungerer, Barnaby van Straaten, Stefan D. Oosterhout, Lucas Stehouwer, Giordano Scappucci, Menno Veldhorst,
• Abstract summary: Experimental work has progressed from linear to two-dimensional arrays of quantum dots.<n>We extend quantum dot arrays in three dimensions to provide opportunities for novel quantum hardware and high-connectivity quantum circuits.
• Score: 0.46951850757696256
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Quantum dots can confine single electrons or holes to define spin qubits that can be operated with high fidelity. Experimental work has progressed from linear to two-dimensional arrays of quantum dots, enabling qubit interactions that are essential for quantum simulation and computation. Here, we explore architectures beyond planar geometries by constructing quantum dot arrays in three dimensions. We realize an eight-quantum dot system in a silicon-germanium heterostructure comprising two stacked germanium quantum wells, where quantum dots are positioned at the vertices of a cuboid. Using electrostatic gate control, we load a single hole into any of the eight quantum dots. To demonstrate the potential of multilayer quantum dot systems, we show coherent spin control and hopping-induced spin rotations by shuttling between the quantum wells. The ability to extend quantum dot arrays in three dimensions provides opportunities for novel quantum hardware and high-connectivity quantum circuits.

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