Silicon Quantum Computing Demonstrates 11-Qubit Processor with High Fidelity and Error Correction

Silicon Quantum Computing and UNSW Sydney have developed an 11-qubit processor linking two nuclear spin qubit registers through an electronic connection, achieving gate fidelities above fault-tolerance benchmarks. The processor, constructed with phosphorus atoms in isotopically purified silicon-28, maintains high performance even as complexity increases.

Single-qubit operations reached fidelities of 99.99%, and two-qubit operations exceeded 99% fidelity. This research addresses challenges in scaling quantum systems, suggesting that modular designs can effectively connect smaller, high-quality qubits.

The system allows for entanglement across registers and demonstrates a strategic calibration method to manage increased complexity. While the processor operates at near absolute zero and presents future challenges, it supports the case for silicon as a foundation for scalable quantum computing.