Stability of PPT in equilibrium states (2505.06882v1)

Published 11 May 2025 in quant-ph, math-ph, and math.MP

Abstract: We use simple spectral perturbation theory to show that the positive partial transpose property is stable under bounded perturbations of the Hamiltonian, for equilibrium states in infinite dimensions. The result holds provided the temperature is high enough, or equivalently, provided the perturbation is small enough.

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