Ensemble Dependence of the Critical Exponent at a Quantum Error Correction Threshold
A new arXiv preprint argues that the choice of statistical ensemble can alter the critical exponent at a quantum error correction threshold, even in the thermodynamic limit. The claim is developed for a simplified model involving single-step encoding.
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What this could mean
- 0–2 yearsPlausible
This could prompt a re-examination of how QEC thresholds are estimated in finite-size simulations, with ensemble choice treated as a relevant variable rather than an irrelevant detail.
If independent work confirms the effect for commonly studied codes such as surface or color codes, extraction of threshold exponents from Monte Carlo or tensor network simulations may need to specify the ensemble, potentially shifting predicted thresholds and near-term hardware targets.
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