A four-qubit germanium quantum processor

Understand

The prospect of building quantum circuits using advanced semiconductor manufacturing positions quantum dots as an attractive platform for quantum information processing.

• Extensive studies on various materials have led to demonstrations of two-qubit logic in gallium arsenide, silicon, and germanium.
• However, interconnecting larger numbers of qubits in semiconductor devices has remained an outstanding challenge.
• Here, we demonstrate a four-qubit quantum processor based on hole spins in germanium quantum dots.