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This research establishes that the classical resources needed to simulate random quantum circuits grow nearly linearly with time, improving upon previous polynomial approximations. The finding provides a tighter bound on when quantum computations become classically intractable, offering critical insight into the fundamental limits of simulation scalability.

Surse care acoperăQuantum Zeitgeist, The Quantum Insider, arXiv, Phys.org

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IBM Research Team Bounds Quantum Circuit Complexity Growth

Quantum Zeitgeist16 septembrie 20261 min de cititArticolul și perspectiva sunt în engleză.

One gate at a time: complexity growth in random quantum circuits Until now, quantifying how quickly simulating quantum computations becomes classically intractable relied upon approximations yielding polynomial improvements only. New calculations demonstrate that computational resources required for these simulations grow almost linearly with time, specifically as Ω(T / log T), up to times around 4ⁿ. This represents an improvement by a factor of poly(n) over existing bounds, offering fresh insight into fundamental limits of quantum computation.

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