Please circulate!
Quantum Matter in Mathematics and Physics (QMMP) 2023:
https://cmsa.fas.harvard.edu/event_category/quantum-matter-seminar/
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This seminar will be in person!
*Time: Oct 20th Fri 10-11:30 am ET*
*Location: Harvard CMSA G10*
Zoom:
https://harvard.zoom.us/j/977347126
Password: cmsa
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Cheryne Jonay (Stanford)
*A Physical Theory of Two-stage Thermalization*
One indication of thermalization time is subsystem entanglement reaching
thermal values. Recent studies on local quantum circuits reveal two
exponential stages with decay rates $r_1$ and $r_2$ of the purity before
and after thermalization. We provide an entanglement membrane theory
interpretation, with $r_1$ corresponding to the domain wall free energy.
Circuit geometry can lead to $r_1 < r_2$, producing a ``phantom
eigenvalue". Competition between the domain wall and magnon leads to $r_2 <
r_1$ when the magnon prevails. However, when the domain wall wins, this
mechanism provides a practical approach for measuring entanglement growth
through local correlation functions.
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