Microsoft and Quantinuum demonstrate logical qubits with 800x lower error rates

Quantinuum/Helios

Applying Microsoft's qubit virtualization and error-correction system to Quantinuum's H2 ion-trap hardware, the two companies ran over 14,000 experiments on logical qubits without a single error, achieving logical error rates 800 times lower than physical qubits. This marks the transition from noisy-intermediate-scale quantum (NISQ) to Level 2 resilient quantum computing.

• Logical error rates 800x lower than physical error rates—largest documented gap between physical and logical errors.
• 14,000+ individual experiments without a single error; demonstrated active error diagnostics and correction on logical qubits.
• First industry transition from Level 1 Foundational to Level 2 Resilient quantum computing capability.
• Quantinuum's H2 hardware achieved 99.8% physical two-qubit fidelity, providing foundation for robust error correction.