Shared control of a 16 semiconductor quantum dot crossbar array

2022/09/14 by Francesco Borsoi, Nico W. Hendrickx, Borsoi, Francesco +15 · 21 citations
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Physics (quant-ph) #Quantum and electron transport phenomena #Quantum-Dot Cellular Automata #Semiconductor Quantum Structures and Devices

paper · pdf · doi:10.48550/arxiv.2209.06609

openalex publication_date 2022/09/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The efficient control of a large number of qubits is one of most challenging aspects for practical quantum computing. Current approaches in solid-state quantum technology are based on brute-force methods, where each and every qubit requires at least one unique control line, an approach that will become unsustainable when scaling to the required millions of qubits. Here, inspired by random access architectures in classical electronics, we introduce the shared control of semiconductor quantum dots to efficiently operate a two-dimensional crossbar array in planar germanium. We tune the entire array, comprising 16 quantum dots, to the few-hole regime and, to isolate an unpaired spin per dot, we confine an odd number of holes in each site. Moving forward, we establish a method for the selective control of the quantum dots interdot coupling and achieve a tunnel coupling tunability over more than 10 GHz. The operation of a quantum electronic device with fewer control terminals than tunable experimental parameters represents a compelling step forward in the construction of scalable quantum technology.

Cited by

• Spin-cQED with bulk germanium spin qubits
• Low-loss frequency-tunable Josephson junction array cavities on Ge/SiGe heterostructures with a tapered etching approach
• Optimal array geometries for kinetic magnetism and Nagaoka polarons
• A manufacturable surface code architecture for spin qubits with fast transversal logic
• Mitigating Residual Exchange Coupling in Resonant Singlet-Triplet Qubits
• Quantum non-Markovian Hatano-Nelson model
• Distributing entanglement between distant semiconductor qubit registers using a shared-control shuttling link
• Feedback stabilization of multi-qubit Hamiltonian parameters enabled by single-shot measurement-based sequential Monte Carlo
• Spatial uniformity of g-tensor and spin-orbit interaction in germanium hole spin qubits
• Switchable spin-photon coupling with hole spins in single-quantum dots
• Tracking spin qubit frequency variations over 912 days
• Overhead in Quantum Circuits with Time-Multiplexed Qubit Control
• Spin ladder quantum simulators from spin-orbit-coupled quantum dot spin qubits
• μ₂T(n): A Method for Extracting the Density Dependent Mobility in Two-Terminal Nanodevices
• Hybrid metal-semiconductor quantum dots in InAs as a platform for quantum simulation
• Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling
• Small Quantum Low Density Parity Check Codes for Near-Term Experiments
• Variability of hole spin qubits in planar Germanium
• Scalable and Tunable In-Plane Ge/Si(001) Nanowires Grown by Molecular Beam Epitaxy
• Fast readout of quantum dot spin qubits via Andreev spins
• Comparison of spin-qubit architectures for quantum error-correcting codes

Related

• Universal control of four singlet-triplet qubits
• A Three-Dimensional Array of Quantum Dots
• A two-dimensional 10-qubit array in germanium with robust and localised qubit control
• Generating Shuttling Procedures for Constrained Silicon Quantum Dot Array
• A trilinear quantum dot architecture for semiconductor spin qubits