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quant-ph2026
Quantum instanton approach to metastable collective spins
Krzysztof Ptaszynski, Maciej Chudak, Massimiliano Esposito
Collective spin systems -- spin ensembles coupled to a common reservoir and effectively described by a single macrospin -- play an important role in both atomic and solid-state phy…
quant-ph2025
Macroscopic theory of multipartite correlations in permutation-invariant open quantum systems
Krzysztof Ptaszynski, Maciej Chudak, Massimiliano Esposito
Information-theoretic quantities have received significant attention as system-independent measures of correlations in many-body quantum systems, e.g., as universal order parameter…