"We tested ever-larger arrays of physical qubits, scaling up from a grid of 3x3 encoded qubits, to a grid of 5x5, to a grid of 7x7 - and each time, using our latest advances in quantum error correction, we were able to cut the error rate in half."
"Scott Aaronson wrote that while not revolutionary, this evolutionary step crowns 30-year long efforts towards fault-tolerance in quantum computing and crosses an important threshold allowing to foresee a moment when 'logical qubits [will] be preserved and acted on for basically arbitrary amounts of time, allowing scalable quantum computation.'"
"Google's result is limited to just one single logical qubit. Furthermore, it only shows logical qubits can scale up while reducing the error rate, not that a low-enough error rate has been achieved."
"Willow's logical error is of the order 10-3, whereas, according to Aaronson, Google aims to reach a 10-6 error rate before saying they created a truly fault-tolerant qubit."
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