A Million Qubits Ran Over Q-Net, and the Room Exhaled

SINGAPORE — When the Singapore Institute ran a million-qubit processor across the Q-Net backbone on the fourteenth, the applause came late — after the error rates settled, not when the count flashed up. The demonstration, the largest coherent run publicly reported, links the machine to the quantum-secured network that has carried unbreakable keys since 2110. Physicist Dr. Wei-Lin Tan is careful about what changed. "Q-Net secures the channel; it does not send a thought faster than light," she said. "The qubits compute here. The network only guarantees no one listens." The run modeled molecular chemistry that would take a classical grid years, Tan said, though she cautioned the machine still needs cryogenic cosseting and cannot yet be trusted unattended. Quanta Lattice Systems, which built the lattice hardware, calls it a proof of scale, not a product. In the lab, a graduate student logged the coherence time and, for the first time all week, went home to sleep.