Until now, describing how quantum information evolves after measurement demanded complete knowledge of complex systems or yielded only featureless approximations. This work introduces an ensemble specifically tailored for nonchaotic free fermions, demonstrating its emergence both through analytical proof using the SYK₂ model and within random Gaussian circuits over extended timescales. The new framework offers a universal account of ‘deep thermalisation’ beyond existing models limited to chaotic scenarios.
Researchers Define New Ensemble for Fermion Thermalisation
Until now, describing how quantum information evolves after measurement demanded complete knowledge of complex systems or yielded only featureless approximations. This work introduces an ensemble specifically tailored for nonchaotic free fermions, demonstrating its emergence both through analytical proof using the SYK₂ model and within random Gaussian circuits over extended timescales. The new framework offers a universal account of ‘deep thermalisation’ beyond existing models limited to chao...