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Sophie Schmieg (sophieschmieg@infosec.exchange)'s status on Monday, 16-Dec-2024 10:43:21 JST Sophie Schmieg
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@wizzwizz4 @apsmith @jasongorman
This is the paper. And yeah, it's as far as I know quite a nice accomplishment, even if the press releases are very cringe.
https://arxiv.org/abs/2408.13687
In conversation about a month ago from gnusocial.jp permalink
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  Quantum error correction below the surface code threshold
  
  Quantum error correction provides a path to reach practical quantum computing by combining multiple physical qubits into a logical qubit, where the logical error rate is suppressed exponentially as more qubits are added. However, this exponential suppression only occurs if the physical error rate is below a critical threshold. In this work, we present two surface code memories operating below this threshold: a distance-7 code and a distance-5 code integrated with a real-time decoder. The logical error rate of our larger quantum memory is suppressed by a factor of $Λ$ = 2.14 $\pm$ 0.02 when increasing the code distance by two, culminating in a 101-qubit distance-7 code with 0.143% $\pm$ 0.003% error per cycle of error correction. This logical memory is also beyond break-even, exceeding its best physical qubit's lifetime by a factor of 2.4 $\pm$ 0.3. We maintain below-threshold performance when decoding in real time, achieving an average decoder latency of 63 $μ$s at distance-5 up to a million cycles, with a cycle time of 1.1 $μ$s. To probe the limits of our error-correction performance, we run repetition codes up to distance-29 and find that logical performance is limited by rare correlated error events occurring approximately once every hour, or 3 $\times$ 10$^9$ cycles. Our results present device performance that, if scaled, could realize the operational requirements of large scale fault-tolerant quantum algorithms.
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  wizzwizz4 (wizzwizz4@fosstodon.org)'s status on Monday, 16-Dec-2024 10:43:22 JST wizzwizz4
  - Jason Gorman
  - Arthur Smith
  @apsmith @jasongorman Do you have a reference for that? I'd be interested in reading about the mathematics, but I can't really bring myself to slog through the breathless press releases again.
  
  In conversation about a month ago permalink
  
  alcinnz repeated this.

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