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A New Proof of the QNEC
Stefan Hollands, Roberto Longo
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Source: Crossref
Published: Oct 3, 2025
DOI: 10.1007/s00220-025-05450-y
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Abstract We give a simplified proof of the quantum null energy condition (QNEC). Our proof is based on an explicit formula for the shape derivative of the relative entropy, with respect to an entangling cut. It allows bypassing the analytic continuation arguments of a previous proof by Ceyhan and Faulkner and can be used e.g., for defining entropy current fluctuations.
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