IBM says it has demonstrated what it calls "trusted quantum advantage," claiming a quantum computer completed a computation beyond the reach of leading classical simulation methods while also providing statistical evidence that the result was accurate.
Quantum advantage refers to any milestone where a quantum computer solves a practical problem faster, cheaper, or more efficiently than the best possible classical computer.
“We are now firmly in the quantum advantage era,” Director of IBM Research and IBM Fellow Jay Gambetta said in a statement. “This milestone gives scientists, developers, and businesses a new foundation for trusting quantum computers as they scale to problems far beyond what we can achieve classically.”
IBM says the experiment also addresses a longstanding criticism of quantum advantage demonstrations: verification. Instead of relying on traditional random circuit sampling, the researchers developed a structured alternative that allows errors to be detected during computation while preserving the mathematical difficulty of the problem.
“Verification remains one of the biggest challenges in firmly establishing experimental quantum advantage,” Associate Professor at the University of Chicago, Bill Fefferman, added. “This experiment develops techniques to better characterize the fidelity of hard quantum states under noise, increasing confidence that the quantum computer is solving a computationally hard problem.”
Over the past year, IBM has continued to build toward those goals.
