2 papers
hep-th2024
Entanglement entropy in type II von Neumann algebra: examples in Double-Scaled SYK
Haifeng Tang
An intriguing feature of type II von Neumann algebra is that the entropy of the mixed states is negative. Although the type classification of von Neumann algebra and its conseq…
hep-th2023
Information recovery in the Hayden-Preskill protocol
Bartlomiej Czech, Sirui Shuai, Haifeng Tang
We revisit information retrieval from evaporating black holes in the Hayden-Preskill protocol, treating the black hole dynamics as Haar-random. We compute, down to the first expone…