Emergent conservation laws and nonthermal states in the mixed-field Ising model

What are some extensions of this paper

Can this paper be linked to the classical KAM theorem

Can this paper be linked to the quantum KAM theorem

is Jonathan one of the author of the paper?

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The advanced AI analysis is not available unless the paper has gone through the moderation. Now it has and it's AI analysis is below: "This paper presents an advanced study on the adiabatic gauge potential (AGP) and its implications in quantum many-body systems, specifically in the context of the KAM theorem, an important result in classical mechanics. The authors establish an AGP-based method that allows the approximation of eigenstates and conserved quantities for interacting systems, using known solutions of nearby integrable models. This concept is similar to the KAM theorem, which suggests the persistence of certain invariant structures when small perturbations are applied to an integrable system. The authors focus on the mixed-field Ising model, a quantum system which exhibits both integrable and non-integrable behavior depending on the parameters. They construct an AGP that generates a unitary rotation, transforming the eigenstates of the simple Hamiltonian into approximate eigenstates of the interacting Hamiltonian. Using the concept of "dressing", they generate approximate eigenstates that are qualitatively different from the undressed versions. Importely, this includes the construction of nonthermal states with finite energy density. One of the key findings is the "dressed all-up" state, a highly non-thermal state far from the edges of the spectrum. It's demonstrated that this state has a high fidelity with an exact eigenstate and a half-chain entanglement entropy of approximately 0.25 bits. This state also has a long lifetime, suggesting potential applications in quantum information protection. The paper also examines the lifetimes of quasiparticles, a concept in quantum physics that describes collective excitations behaving like particles. They establish that the energy variance of the approximate eigenstates gives a lower bound on the quasiparticle lifetime. By analyzing the time-dependent state overlap under second order perturbation theory, they provide explicit examples of these timescales for different excited states. Another major focus is on the quasi-particle parameter dependence. They define a measure of the quasi-particle lifetime within a particular subspace, denoted by Γ, which corresponds to the normalized average inverse lifetime, or equivalently the average energy variance. A small value of Γ indicates a successful block-diagonalization procedure with well-defined quasi-particles within the subspace. Finally, they provide a way to construct approximately conserved local operators using the dressed eigenstates. They demonstrate that these operators can be used to construct long-lived quasiparticle excitations, even at infinite temperature. This leads to the conclusion that even if a system is not integrable or exactly solvable, local long-lived symmetries and conservation laws can still exist if the system is close to an integrable point. Overall, this paper presents a novel approach to quantum many-body systems, using AGP to approximate eigenstates and conserved quantities of interacting systems based on nearby integrable models. This approach presents a new perspective on integrability breaking and paves the way for future research in this field." Based on this you can ask questions including this one: Can this paper be linked to the quantum KAM theorem?

How do the authors construct approximate conservation laws?