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Thursday, April 22, 2010
12:30 PM - 2:00 PM
T-DO Conference Room, TA-03 - Bldg 123 - Room 121

Quantum Lunch

Dynamics of an inhomogeneous quantum phase transition

Marek Rams
Jagiellonian University

I will discuss a second order quantum phase transition driven by an inhomogeneous quench. I will argue that the density of quasiparticle excitations resulting from passing the critical point is suppressed when velocity at which a critical point propagates across a system falls below a threshold velocity equal to the Kibble-Zurek correlation length times the energy gap at freeze-out divided by hbar. This general prediction will be supported by an analytic solution in the quantum Ising chain. Our results suggest, in particular, that adiabatic quantum computers can be made more adiabatic when operated in an “inhomogeneous” way.

Host: Bogdan Damski