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

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.

6 pages v2: modified protocol to discuss total angular momentum, corrected typos, added references v3: updated with referee feedback

References in corpus (4)

• A bound on chaos
• Black holes as mirrors: quantum information in random subsystems
• Unitarity and Holography in Gravitational Physics
• Information Recovery From Black Holes

Cited by in corpus (6)

• Black Holes: Eliminating Information or Illuminating New Physics?
• Information retrieval from black holes
• Qubit Transport Model for Unitary Black Hole Evaporation without Firewalls
• What can we learn about islands and state paradox from quantum information theory?
• Quantum gravity tomography
• Quantum circuit simulation of black hole evaporation and Maxwell demon interpretation