D-Wave on rails: Company tests entanglement on its dual-rail qubits
Company noted for building quantum annealers now also making gate-based hardware.
D-Wave has spent decades being the outlier of quantum computing, the company that built a specialized machine for optimization problems while everyone else chased the general-purpose gate model. That positioning made it easy to dismiss. It also made it easy to forget that the company never stopped building hardware.
Wednesday's paper in Nature is a quiet confirmation that the strategy has shifted. D-Wave is now validating the dual-rail qubit technology it acquired with Quantum Circuits, and the result is a demonstration of entanglement between two of those qubits without sacrificing the error-detection property that makes the design attractive. The significance is not the entanglement itself, which is table stakes for any serious qubit. It is that the company is now playing the same game as IBM, Google, and Amazon, and doing so with a technology that could simplify error correction.
The dual-rail approach encodes a qubit in two physical rails, so most errors announce themselves by the qubit simply leaving the computational space. That is a structural advantage, not a tuning trick. It does not eliminate the need for error correction, but it makes the errors easier to find, and finding errors is most of the battle.
D-Wave's move into gate-based hardware is also a reminder that the quantum computing market is consolidating around a few viable qubit technologies. The company that was once the contrarian is now acquiring, integrating, and publishing in Nature. The annealer business still exists, but the future of the company is increasingly written in the language of its former rivals.