Hybrid generative quantum circuits guided by local observable correlators sample diverse ensembles whose span reproduces degenerate ground spaces in Majumdar-Ghosh, AKLT, and XXZ models.
Entanglement in the Majumdar-Ghosh model
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abstract
We present an analysis of the entanglement characteristics in the Majumdar-Ghosh (MG) or $J_{1}$-$J_{2}$ Heisenberg model. For a system consisting of up to 28 spins, there is a deviation from the scaling behaviour of the entanglement entropy characterizing the unfrustrated Heisenberg chain as soon as $J_{2} >0.25$. This feature can be used as an indicator of the dimer phase transition that occurs at $J_{2} = J_{2}^{*} \approx 0.2411 J_{1}$. Additionally, we also consider entanglement at the MG point $J_{2}=0.5 J_{1}$.
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quant-ph 1years
2026 1verdicts
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Local-Observable-Guided Generative Quantum Circuits for Degenerate Ground Spaces
Hybrid generative quantum circuits guided by local observable correlators sample diverse ensembles whose span reproduces degenerate ground spaces in Majumdar-Ghosh, AKLT, and XXZ models.