Correlation loss and multipartite entanglement across a black hole horizon

Gerardo Adesso, Ivette Fuentes-Schuller

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    21 Citations (Scopus)


    We investigate the Hawking effect on entangled fields. By considering a scalar field which is in a two-mode squeezed state from the point of view of freely falling (Kruskal) observers crossing the horizon of a Schwarzschild black hole, we study the degradation of quantum and classical correlations in the state from the perspective of Schwarzschild observers confined outside the horizon. Due to monogamy constraints on the entanglement distribution, we show that the lost bipartite entanglement is recovered as multipartite entanglement among modes inside and outside the horizon. In the limit of a small-mass black hole, no bipartite entanglement is detected outside the horizon, while the genuine multipartite entanglement interlinking the inner and enter regions grows infinitely.

    Original languageEnglish
    Pages (from-to)657-665
    Number of pages9
    JournalQuantum Information & Computation
    Issue number7-8
    Publication statusPublished - Jul 2009


    • Multipartite entanglement
    • continuous variable correlations
    • Hawking-Unruh effect
    • Schwarzschild black holes


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