A team of Harvard physicists has built a quantum computing machine that can operate continuously without restarting, achieving a significant milestone in experimental quantum hardware.
Until now, quantum computing systems have typically run only for milliseconds or seconds before decoherence or atom loss forces a reset. But in a new setup, the team sustained operation for more than two hours, and they claim that, in theory, it could run indefinitely.
The breakthrough depends on a design that uses an optical lattice conveyor belt together with optical tweezers. These tools allow the system to replenish qubits (atoms) in real time, injecting new atoms at a rate of 300,000 per second into a 3,000-qubit array, to counteract atom loss and maintain quantum information.
Overcoming atom loss has been one of the biggest bottlenecks in scaling quantum computers. Without that fix, durability and error accumulation limit usability. With this experiment, the researchers demonstrate a path toward more robust, always-on quantum platforms.
Mikhail Lukin, who leads Harvard’s quantum research, said that while scaling remains challenging, the approach appears compatible with larger systems. Collaboration with MIT physicist Vladan Vuletić suggested that machines capable of indefinite operation could be within reach in as little as three years.
Applications in cryptography, materials simulation, finance, and medicine could benefit enormously if quantum machines can reliably operate over long durations. The new design resets a key assumption in quantum systems, shifting focus from short bursts of computation to sustained, fault-tolerant operation.
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