Quantum/Gravity Seminar Series
Unless otherwise noted, seminars take place at 11:10 am on Thursdays in Abelson 333.
Fall 2024 Seminars
September 5, 2024
Gong Cheng, Virginia Tech
September 12, 2024
Title: Gravitational back-reaction is magical.
Abstract: We study the interplay between magic and entanglement in quantum many-body systems. We show that non-local magic, which is supported by the quantum correlations is lower bounded by the non-flatness of entanglement spectrum and upper bounded by the amount of entanglement in the system. We then argue that a smoothed version of non-local magic bounds the hardness of classical simulations for incompressible states. In conformal field theories, we conjecture that the non-local magic should scale linearly with entanglement entropy but sublinearly when an approximation of the state is allowed. We support the conjectures using both analytical arguments based on unitary distillation and numerical data from an Ising CFT. If the CFT has a holographic dual, then we prove that the non-local magic vanishes if and only if there is no gravitational back-reaction. Furthermore, we show that non-local magic is approximately equal to the rate of change of the minimal surface area in response to the change of cosmic brane tension in the bulk.
September 19, 2024
September 26, 2024
No Seminar
October 3, 2024
October 10, 2024
No Seminar
October 17, 2024
October 22, 2024
Note unusual dayNo Seminar
October 24, 2024
October 31, 2024
November 7, 2024
November 14, 2024
November 21, 2024
No Seminar
November 28, 2024
December 5, 2024