Environmental records unlock universal quantum computation from thermal decoherence
A preprint classifies when a stabilizer quantum processor subjected to thermal decoherence becomes capable of universal quantum computation. The authors show that at the same level of thermal exposure, the processor can be either classically simulable or quantum universal depending on which energy-counting records about the environment the controller keeps. The result is an exact classification for thermal-idle instruments under ideal stabilizer control and independent local Markovian noise.
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What this could mean
- 0–2 yearsPlausible
Near-term stabilizer-hardware experiments could use selected environmental measurement records to induce non-Clifford operations, enabling universal circuit execution without a dedicated magic-state source.
The classification identifies which energy-counting thermal-idle instruments push a stabilizer processor past classical simulability; existing superconducting and trapped-ion stabilizer processors already operate under thermal noise and can record some environmental outcomes, so an experimental team could implement the relevant instruments if selective energy-counting measurements are feasible.
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