A Programmable and Reconfigurable Photonic Simulator for Classical XY Models
arxiv(2024)
摘要
The classical spin models attracts growing interests since many optimization
problems can be mapped to searching the ground states of these models. However,
solving such problems on conventional computers requires exponentially growing
resources. In this work, we proposed and experimentally demonstrated a photonic
simulator for classical XY models. By encoding the XY spins on the phase term
of the input light field, the corresponding XY Hamiltonian could be performed
on the output light intensities. The simulator is mainly based on a
programmable and reconfigurable optical vector-matrix multiplication system,
which can map arbitrary XY models within the dimensionality limit. We first
demonstrate the Berezinskii-Kosterlitz-Thouless transition in a two-dimensional
XY model, in which the expectation values of some observables are calculated
and consistent with the theory. Besides, we performed the ground state search
of two 25-spin XY models with different spin connections and coupling
strengths. Our proposal paves a new way to investigate the XY spin system.
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