A Ising model open chain and periodic boundary conditions

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The one-dimensional Ising model is typically analyzed as an open chain system with free ends, but when an external field is introduced, it is often treated with cyclic boundary conditions. The equivalence of these methods is questioned, particularly regarding the computational costs associated with the quantum treatment of the transverse-field Ising model, which increases exponentially with the number of spins. For infinite 1D lattices, the classical transverse-field Ising model can be effectively approximated using Maximal Entropy Random Walk (MERW). Additionally, the 2D classical Ising model with finite width can be solved analytically using MERW under cyclic boundary conditions. Understanding these methods and their implications is crucial for advancing computational techniques in statistical physics.
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One dimensional Ising model is often treated as open chain system with free ends. Then when external field is added it is treated with cyclic boundary condition. Can someone explain me are those methods equivalent, or not?
 
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The main reason is probably computational cost of quantum treatment of transverse-filed Ising model, naively growing exponentially with the number of spins.

However, classical transverse field Ising model for infinite 1D lattice can be well approximated with MERW ( https://en.wikipedia.org/wiki/Maximal_entropy_random_walk ).
Also, 2D classical Ising for finite width approximation: "w x infinity" lattice e.g. with cyclic boundary conditions can be solved analytically with MERW - for both see https://arxiv.org/pdf/1912.13300
 
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