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quant-ph2026
Emergent Non-Markovian Nonlinear Qubit From Collective Spin Interactions
Gregory T. Carroll, Michael R. Geller, Andre Erpenbeck
Open-system descriptions are typically introduced by coupling a quantum system to an external environment. Here we show that a closed interacting many-body system can itself genera…
cond-mat.str-el2026
Validity and Limits of Low Order Hybridization Expansion Approaches for Multi-Orbital Systems
Dolev Goldberger, Ido Zemach, Lei Zhang +4
Low-order hybridization expansion methods such as the non-crossing approximation (NCA) and the one-crossing approximation (OCA) are widely used impurity solvers in the study of str…