D-Wave is a bit of an oddity in the quantum computing space, having been founded back in the last century. Instead, the company built what’s now called a quantum annealer, a machine that isn’t general-purpose but can solve a large class of optimization problems. But a few years back, D-Wave started working on gate-based hardware, apparently choosing a somewhat unusual qubit technology called fluxonium. ResonatingThe basic structure of a dual-rail qubit depends on making two linked resonators, which we’ll call left and right. Crucially, photon loss can be easily detected with the right hardware, without needing additional qubits required to run an error-correction code.