Exact quench dynamics from thermal pure quantum states
Abstract
We present an exact solution for entanglement entropy for the real-time dynamics following a quench from a thermal pure quantum (TPQ) state in a free-fermion system. In contrast to the usual linear growth and saturation behavior, the entanglement entropy exhibits a characteristic double-plateau structure. We establish this behavior through three complementary approaches: an exact conformal field theory calculation on the Klein bottle, finite-size Gaussian-state simulations, and a quasiparticle picture that becomes quantitatively accurate in the scaling regime.
Fields of Study & Subjects
Cold Atom Physics and Bose-Einstein Condensates
Quantum
superfluid
helium dynamics
Publication details
- Journal / source
- Physical review. B./Physical review. B
- Publisher
- American Physical Society (APS)
- Volume
- 114
- Issue
- 2
- Publication date
- 8 June 2026
- Language
- EN