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Frustration-Induced Expressibility Limitations in Variational Quantum Algorithms

quant-ph · 2026-04-13 · unverdicted · novelty 5.0

Geometric frustration in a square-lattice Ising model with diagonal couplings produces strongly inhomogeneous correlations that standard Hamiltonian-inspired variational ansatze cannot capture efficiently, increasing required circuit depth until bond-resolved parameters are introduced.

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