JP Morgan Chase and Quantinuum get fault-tolerant algorithms running

Researchers have achieved fault-tolerant execution of quantum algorithms using 97 physical qubits, a significant step toward scalable quantum computation. The team from JPMorganChase and Quantinuum demonstrated the Quantum Approximate Optimization Algorithm and the Harrow-Hassidim-Lloyd algorithm on Quantinuum’s H2 and Helios processors, using the ⟦ 7, 1, 3 ⟧ Steane code for error correction. This work marks the first end-to-end execution of logical quantum algorithms using only fault-tolerant components, with the results showing better-than-random performance even with complex circuits containing 2132 two-qubit gates. A logical T gate, important for universal quantum computation using the Steane code, achieved 0.960(6) fidelity, a significant improvement over prior non-fault-tolerant implementations which demonstrated an infidelity of 14× 10–3. This new gate, tested on Quantinuum’s H2-1 processor,…