D-Wave tests entanglement on dual-rail qubits, a step toward fault tolerance

D-Wave published a study in Nature demonstrating a fast two-qubit entangling gate with roughly 99.9% fidelity on its dual-rail superconducting qubit architecture, which preserves built-in, hardware-level error detection.

The gate runs in about 500 nanoseconds. As part of the study, researchers generated a logical Bell state with 98.8% fidelity, with an entanglement storage time an order of magnitude longer than that of the uncorrected physical counterpart. Per D-Wave's simulations, the dual-rail architecture could cut the logical error rate by as much as 10x per error-correction scaling increment, significantly reducing the physical qubit overhead required. "Gate-model quantum computing's greatest remaining challenge is not simply building more qubits. It is building systems that can correct errors efficiently as they scale," said D-Wave CEO Dr. Alan Baratz.

• Two-qubit gate fidelity of roughly 99.9%, with a gate time of about 500 nanoseconds
• A logical Bell state was achieved at 98.8% fidelity
• Per the company's simulations, the logical error rate could drop 10x per correction increment

Progress in quantum computing is watched closely by the crypto industry too — not as a reason for panic, but as a long-term risk factor for the cryptography that underpins bitcoin. Just today we covered how TV host Jim Cramer sold his bitcoin specifically over quantum computing fears. Technical announcements like D-Wave's don't bring a real "quantum threat" meaningfully closer on their own — they're about error correction in gate-model systems, not breaking cryptography directly — but they're exactly the kind of milestone the industry uses to gauge how fast progress is actually moving.

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