QuTech QARPET Chip Benchmarks 1,058 Spin Qubits at 2 Million Qubits/mm²

QuTech (TU Delft) published the QARPET platform (Qubit-Array Research Platform for Engineering and Testing) in Nature Electronics - a crossbar-tiled chip architecture that can host up to 1,058 semiconductor spin qubits in a 23×23 grid, requiring only 53 control lines. The chip achieves a potential density of approximately two million qubits per square millimeter.

Why This Matters: Scaling quantum processors requires understanding statistical qubit properties across large arrays. QARPET brings semiconductor qubit testing in line with traditional chip industry practices, enabling hundreds of qubits to be characterized in a single cooldown. This platform accelerates the path to million-qubit semiconductor quantum computers, which leverage existing CMOS fabrication infrastructure.