Sampling approximately low-rank Ising models: MCMC meets variational methods

F Koehler, H Lee, A Risteski - Conference on Learning …, 2022 - proceedings.mlr.press
We consider Ising models on the hypercube with a general interaction matrix $ J $, and give
a polynomial time sampling algorithm when all but $ O (1) $ eigenvalues of $ J $ lie in an …

Finite-size scaling, phase coexistence, and algorithms for the random cluster model on random graphs

T Helmuth, M Jenssen, W Perkins - … de l'Institut Henri Poincare (B) …, 2023 - projecteuclid.org
For Δ≥ 5 and q large as a function of Δ, we give a detailed picture of the phase transition of
the random cluster model on random Δ-regular graphs. In particular, we determine the …

Efficient sampling and counting algorithms for the Potts model on ℤᵈ at all temperatures

C Borgs, J Chayes, T Helmuth, W Perkins… - Proceedings of the 52nd …, 2020 - dl.acm.org
For d≥ 2 and all q≥ q 0 (d) we give an efficient algorithm to approximately sample from the
q-state ferromagnetic Potts and random cluster models on the torus (ℤ/n ℤ) d for any inverse …

Algorithms for the ferromagnetic Potts model on expanders

C Carlson, E Davies, N Fraiman, A Kolla… - Combinatorics …, 2024 - cambridge.org
We give algorithms for approximating the partition function of the ferromagnetic $ q $-color
Potts model on graphs of maximum degree $ d $. Our primary contribution is a fully …

Polynomial-Time Preparation of Low-Temperature Gibbs States for 2D Toric Code

Z Ding, B Li, L Lin, R Zhang - arXiv preprint arXiv:2410.01206, 2024 - arxiv.org
We propose a polynomial-time algorithm for preparing the Gibbs state of the two-
dimensional toric code Hamiltonian at any temperature, starting from any initial condition …

A near-linear time sampler for the Ising model with external field

X Chen, X Zhang - Proceedings of the 2023 Annual ACM-SIAM …, 2023 - SIAM
We give a near-linear time sampler for the Gibbs distribution of the ferromagnetic Ising
models with edge activities β> 1 and external fields λ< 1 (or symmetrically, λ> 1) on general …

Approximately counting independent sets in bipartite graphs via graph containers

M Jenssen, W Perkins… - Random Structures & …, 2023 - Wiley Online Library
By implementing algorithmic versions of Sapozhenko's graph container methods, we give
new algorithms for approximating the number of independent sets in bipartite graphs. Our …

Sampling from the Potts model at low temperatures via Swendsen–Wang dynamics

A Blanca, R Gheissari - 2023 IEEE 64th Annual Symposium on …, 2023 - ieeexplore.ieee.org
Sampling from the q-state ferromagnetic Potts model is a fundamental question in statistical
physics, probability theory, and theoretical computer science. On general graphs, this …

Fast algorithms for general spin systems on bipartite expanders

A Galanis, LA Goldberg, J Stewart - ACM Transactions on Computation …, 2021 - dl.acm.org
A spin system is a framework in which the vertices of a graph are assigned spins from a finite
set. The interactions between neighbouring spins give rise to weights, so a spin assignment …

Fast and perfect sampling of subgraphs and polymer systems

A Blanca, S Cannon, W Perkins - ACM Transactions on Algorithms, 2024 - dl.acm.org
We give an efficient perfect sampling algorithm for weighted, connected induced subgraphs
(or graphlets) of rooted, bounded degree graphs. Our algorithm utilizes a vertex-percolation …