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arXiv:1507.03592hep-th

How to Recover a Qubit That Has Fallen Into a Black Hole

Aidan Chatwin-Davies, Adam S. Jermyn, Sean M. Carroll

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Abstract

We demonstrate an algorithm for the retrieval of a qubit, encoded in spin angular momentum, that has been dropped into a no-firewall black hole. Retrieval is achieved analogously to quantum teleportation by collecting Hawking radiation and performing measurements on the black hole. Importantly, these methods only require the ability to perform measurements from outside the event horizon.

arXiv comments
6 pages v2: modified protocol to discuss total angular momentum, corrected typos, added references v3: updated with referee feedback
Journal reference
Phys. Rev. Lett. 115, 261302 (2015)
DOI
doi:10.1103/PhysRevLett.115.261302
Subjects
hep-thHigh Energy Physics, Theory gr-qcGeneral Relativity and Quantum Cosmology quant-phQuantum Physics

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