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Quantum Simulation Quantum Thermodynamics

Ground state and persistent oscillations in the quantum East model

arXiv
Authors: Adway Kumar Das, Achilleas Lazarides

Year

2026

Paper ID

18137

Status

Preprint

Abstract Read

~2 min

Abstract Words

112

Citations

N/A

Abstract

For the 1D quantum East model with open boundaries, we show that in the limit s → -infty, the ground state is accurately captured by a simple spin-coherent product state. We further identify a low-entanglement excited eigenstate that differs from the ground state only by a π-rotation of the boundary spin, remaining well approximated by a spin-coherent state. For a range of -infty<s<0, the edge-coherent product state overlaps with two eigenstates separated by a size-independent energy gap, leading to persistent coherent oscillations of both global and local observables in the thermodynamic limit. These oscillations originate from boundary physics and are distinct from quantum many-body scars or hypercube-like Fock-space mechanisms.

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  • This paper contributes to the Quantum Simulation research area in the Quantum Articles archive.
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  • For the 1D quantum East model with open boundaries, we show that in the limit s -> -infty, the ground state is accurately captured by a simple spin-coherent product state.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2602.23422 [2] arXiv https://arxiv.org/abs/2602.23422 [3] Publisher https://arxiv.org/abs/2602.23422

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