From qubits to black holes: entropy, entanglement and all that

Details From qubits to black holes: entropy, entanglement and all that From qubits to black holes: entropy, entanglement and all that

2005-05-13

arxiv.org/abs/gr-qc/0505068v1

Int.J.Mod.Phys. D14 (2005) 2307-2314

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Honorable Mention in the 2005 Gravity Research Foundation Essay Competition

Scientific paper

Entropy plays a crucial role in characterization of information and entanglement, but it is not a scalar quantity and for many systems it is different for different relativistic observers. Loop quantum gravity predicts the Bekenstein-Hawking term for black hole entropy and logarithmic correction to it. The latter originates in the entanglement between the pieces of spin networks that describe black hole horizon. Entanglement between gravity and matter may restore the unitarity in the black hole evaporation process. If the collapsing matter is assumed to be initially in a pure state, then entropy of the Hawking radiation is exactly the created entanglement between matter and gravity.

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