Geometry And Quantum Noise

Understand

We study the fine structure of long-time quantum noise in correlation functions of AdS/CFT systems.

• Under standard assumptions of quantum chaos for the dynamics and the observables, we estimate the size of exponentially small oscillations and trace them back to geometrical features of the bulk system.
• The noise level is highly suppressed by the amount of dynamical chaos and the amount of quantum impurity in the states.
• This implies that, despite their missing on the details of Poincare recurrences, `virtual' thermal AdS phases do control the overall noise amplitude even at high temperatures where the thermal ensemble is dominated by large AdS black holes.