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1983 paper on entanglement entropy: "On the Entropy of the Vacuum outside a Horizon"

I introduce the concept of *entanglement entropy* (as it's now called) and point out that it follows an *area law* which renders it a suitable source of black hole entropy. I also suggest to conceive the latter as residing on the horizon at approximately one bit per "Planckian plaquette".

preprint2014arXivOpen access
Rafael D. Sorkin
cond-mat.stat-mechgr-qchep-thquant-ph
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Rafael D. Sorkin

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