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arxiv 2406.05324 v6 pith:7N4WEU7A submitted 2024-06-08 cond-mat.str-el cond-mat.stat-mechhep-thphysics.comp-phquant-ph

Bipartite reweight-annealing algorithm of quantum Monte Carlo to extract large-scale data of entanglement entropy and its derivative

classification cond-mat.str-el cond-mat.stat-mechhep-thphysics.comp-phquant-ph
keywords derivativedataschemecarlocomputingcriticaldifferententanglement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We propose a quantum Monte Carlo scheme capable of extracting large-scale data of R\'enyi entanglement entropy (EE) with high precision and low technical barrier. Instead of directly computing the ratio of two partition functions within different space-time manifolds, we obtain them separately via a reweight-annealing scheme and connect them from the ratio of a reference point. The incremental process can thus be designed along a path of real physical parameters within this framework, and all intermediates are meaningful EEs corresponding to these parameters. In a single simulation, we can obtain many multiples ($\sim \beta L^d$, d is the space dimension) of EEs, which has been proven to be powerful for determining phase transition points and critical exponents. Additionally, we introduce a formula to calculate the derivative of EE without resorting to numerical differentiation from dense EE data. This formula only requires computing the difference of energies in different space-time manifolds. The calculation of EE and its derivative becomes much cheaper and simpler in our scheme. We then demonstrate the feasibility of using EE and its derivative to find phase transition points, critical exponents, and various phases.

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Cited by 2 Pith papers

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    hep-th 2026-07 accept novelty 7.0

    The derivative of entanglement entropy with respect to subregion volume equals the thermal entropy density in the large-subregion limit, verified via lattice simulations of the finite-density O(4) model using dual wor...

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    cond-mat.str-el 2026-05 unverdicted novelty 6.0

    Derives universal angle-dependent corner contributions to charge fluctuations in higher-dimensional quantum systems, with benchmarks at O(3) critical points and even-odd effects in metals.