Topological R\'enyi entropy after a quantum quench

Understand

We present an analytical study on the resilience of topological order after a quantum quench.

• The system is initially prepared in the ground state of the toric-code model, and then quenched by switching on an external magnetic field.
• During the subsequent time evolution, the variation in topological order is detected via the topological Renyi entropy of order 2.
• We consider two different quenches: the first one has an exact solution, while the second one requires perturbation theory.