Simulating Ising-Like Models on Quantum Computer
Abstract
Due to the complexity of lattice models of statistical physics, there is interest in developing new approaches to study them, including those using quantum technologies. In this paper, we describe and implement a scheme for applying the Variational Quantum Eigensolver to the problem of finding the free energy and magnetization in the thermodynamic limit of the n-chain generalized planar Ising model with the interaction of nearest neighbors, next nearest neighbors, and plaquette interactions. The calculation of Rayleigh quotient for transfer matrix is described in detail for n = 1,2,3. Using special parameterizations of the state of the system of qubits and transfer matrix decomposition, free energy and magnetization are calculated for 3-chain model on a quantum computer emulator. The entire computation process, including quantum computer emulation, is implemented using the Python programming language. Also, a method is proposed for significant acceleration of calculations (by about 10.000 times) on the emulator for considered models. Confidence intervals are constructed for the found characteristics of the model.
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