Physics @ Berkeley
Events in Physics
Title: Black Holes As Mirrors    (Colloquia)
Start Date: 02/02/2009
Time: 4:30 pm
Location: 1 LeConte
Speaker: Patrick Hayden
Affiliation: McGill University

I\'ll discuss information retrieval from evaporating black holes, assuming that the internal dynamics of a black hole is unitary and rapidly mixing. Instead of locking away information for a near eternity, black holes can reveal their information in Hawking radiation remarkably quickly. The resulting estimate of a black hole\'s information retention time, based on speculative dynamical assumptions, is just barely compatible with the black hole complementarity hypothesis. The reason these conclusions hold is that typical local quantum circuits generate highly efficient quantum error-correcting codes. (Joint work with John Preskill.)