Quantum computers promise to revolutionize fields from drug discovery to cryptography, but they remain plagued by a fundamental flaw: the information they process vanishes unpredictably. Now, scientists have devised a way to measure that data loss more than 100 times faster than previously possible, offering researchers their first near-real-time view of what goes wrong inside these fragile machines.
The breakthrough comes from an international team led by the Niels Bohr Institute in Copenhagen, working in collaboration with researchers at the Norwegian University of Science and Technology. As reported by Science Daily, the method slashes the time needed to measure how long a qubit — the quantum equivalent of a classical computer bit — can hold its information from roughly one second down to about 10 milliseconds.
"In the widely used superconducting qubits, the time it takes for information to disappear is, on average, reasonable. But it seems to vary randomly over time," explained Jeroen Danon, a professor of physics at NTNU. That unpredictability has been a major obstacle. Without knowing exactly how and when data breaks down, engineers have been largely flying blind when trying to stabilize quantum processors.
The new technique changes that equation dramatically. By tracking quantum information loss as it happens, the method reveals subtle, rapid fluctuations that older approaches simply couldn't detect. "This will in turn make it easier to identify the underlying causes that make the information disappear," Danon said.
The implications extend well beyond the laboratory. Reliable quantum computing depends on maintaining qubit stability long enough to perform meaningful calculations. With a tool that can pinpoint the sources of instability in near real time, researchers are better positioned to engineer solutions — bringing the long-promised quantum revolution a meaningful step closer to reality.
