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Entanglement in the $θ$-vacuum
high-energy-physics-latticehigh-energy-physics-phenomenologyhigh-energy-physics-theoryquantum-physicsstrongly-correlated-electrons
We compute the entanglement entropy and the entanglement spectrum of the vacuum state in the massive Schwinger model at a finite $θ$ angle. By computing two-point correlation functions we show that the correlation length diverges in the critical region. We clarify the physical origin of entanglement
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