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Google has quantum algorithm

Ref: https://arstechnica.com/science/2025/10/google-claims-to-have-quantum-advantage-with-a-potentially-useful-algorithm/?utm_source=tldrnewsletter


Here is a summary of the key points:

  • Verifiable Quantum Advantage: Google's Quantum AI team claims to have achieved the first-ever demonstration of verifiable quantum advantage using their Willow quantum chip.

  • The Algorithm: The breakthrough was achieved by executing a novel, peer-reviewed algorithm called Quantum Echoes.

  • Performance Leap: The Quantum Echoes algorithm, run on the Willow chip, performed a specific, scientifically meaningful physics simulation task approximately 13,000 times faster than state-of-the-art classical methods running on the world's leading supercomputers (like Frontier).

  • Practical Use: Unlike previous "quantum supremacy" demonstrations that were often criticized as being narrow and unverifiable, this result is considered a step toward useful quantum computation. The task tackled—exploring quantum interference effects—has practical applications in fields like nuclear magnetic resonance (NMR) spectroscopy, which is used for analyzing molecular structure.

  • Verifiability: A crucial aspect of this claim is that the result is verifiable, meaning it can be efficiently checked for correctness, which addresses a key skepticism about previous quantum advantage claims.

  • Hardware and Roadmap: This advance is powered by the high-precision Willow chip (a 105-qubit array). Google states this marks another critical step toward its ultimate goal of building a fault-tolerant quantum computer.

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