Hayden-Preskill thought experiment

In quantum information, the Hayden-Preskill thought experiment (also known as the Hayden-Preskill protocol) is a thought experiment that investigates the black hole information paradox by hypothesizing on how long it takes to decode information thrown in a black hole from its Hawking radiation.[1]

The thought experiment concerning Alice and Bob is as follows: Alice throws a k qubit quantum state into a black hole that is entangled with Bob's quantum computer. Bob collects the Hawking radiation emitted by the Black hole and feeds it into his quantum computer where he applies the appropriate quantum gates that will decode Alice's state. Bob only needs at least k qubits from the black hole's Hawking radiation to decode Alice's quantum state.[2]

References
  1. Hayden, Patrick; Preskill, John (2007). "Black holes as mirrors: Quantum information in random subsystems". Journal of High Energy Physics. 2007 (9): 120. arXiv:0708.4025v2. Bibcode:2007JHEP...09..120H. doi:10.1088/1126-6708/2007/09/120. S2CID 15261400.
  2. John Preskill (April 2017). "Here's one way to get out of a black hole!". Quantum Frontiers. Retrieved 2019-06-30.
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