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quant-ph2026
Boltzmann counting in Hilbert space
Raúl O. Vallejos, Isadora Veeren, Frederico Brito +1
We introduce a geometric entropy for quantum preparations, defined as the logarithm of the Hilbert-space volume of pure states compatible with a given set of constraints. This cons…
quant-ph2026
When Isolated Quantum Systems Appear Classical
Thiago R. de Oliveira, Pedro S. Correia, Tiago Debarba +3
The emergence of classical behavior and the origin of thermal equilibrium are two central problems in the foundations of physics. In the standard accounts, both phenomena are typic…
quant-ph2026
Comparing Classical Simulation and Sample-Based Learning of Quantum Systems
João Pedro d'El-Rey, Raúl O. Vallejos, Fernando de Melo
We investigate the relationship between two distinct classical approaches to quantum systems: direct simulation from a classical description and sample-based learning from measurem…