Theoretical Physics Colloquium
Quantum criticality, quenches and the Loschmidt echo
by Prof. Amit Dutta (IIT Kanpur)
Tuesday, October 29, 2013
from
to
(Asia/Kolkata)
at Colaba Campus ( AG69 )
at Colaba Campus ( AG69 )
Description |
I shall introduce the notion of the Loschmidt echo using the central spin model in which a central spin (qubit) is globally coupled to a spin chain. I shall indicate how does the Loschmidt echo behave close to a quantum critical point and how it is also related to the decoherence of the central spin which was initially in a pure state. Finally, I shall discuss at some length the behavior of the echo when the spin chain is driven across a quantum critical point suddenly or slowly. |