Researchers Trace Silicon Qubit Variability to Atomic Disorder in 12-Qubit Intel Processor
Updated
Updated · The Quantum Insider · Aug 12
Researchers Trace Silicon Qubit Variability to Atomic Disorder in 12-Qubit Intel Processor
2 articles · Updated · The Quantum Insider · Aug 12
Summary
Atomic-scale disorder in silicon quantum wells emerged as the main driver of valley-splitting variability, a long-standing source of errors and lower fidelity in silicon spin qubits.
Using electrical spectroscopy at Argonne’s Chicago Quantum Computing Testbed, the team mapped valley splitting across an Intel-fabricated 12-qubit-class silicon quantum dot processor by shifting a quantum dot through the material.
Distance-based analysis linked the fluctuations to random atomic-scale variations in the alloyed quantum well, pinpointing the root cause rather than treating the problem as unexplained device-to-device inconsistency.
The result reframes valley splitting from a physics mystery into a materials-engineering target, offering chipmakers and national labs a clearer route to more consistent, scalable silicon quantum hardware.