3 papers
quant-ph2026
Reading Weakly, Acting Strongly: A Static Parity Horizon and its Dynamical Bypass in the Monitored Lipkin-Meshkov-Glick Model
Stavros Mouslopoulos
We study the broken-symmetry phase of the Lipkin-Meshkov-Glick (LMG) model, whose two lowest states form a near-degenerate parity doublet split by tunnelling. We show that the same…
quant-ph2026
Which Coherence Decoheres? Basis-Dependent Decoherence Rates in Symmetry-Broken Collective Spin Systems
Stavros Mouslopoulos
In the ordered phase of a -symmetric collective spin system, two natural bases -- localised pointer states and energy eigenstates $\{|E_0\ra…
quant-ph2026
Classically Forbidden Signatures of Quantum Coherence in the Mesoscopic Lipkin-Meshkov-Glick Model
Stavros Mouslopoulos
We derive strict quantitative conditions under which a collective quantum system of N~370 spins exhibits classically forbidden temporal correlations in a spinor Bose-Einstein conde…