ITAMP Topical Lunch Discussion
Date: FRIDAY, May 30
Time: 12:00-1:30 pm
Pizza will be served.
Location: B-106 @ Center for Astrophysics (60 Garden Street)
Directions: after entering the lobby of the CfA, turn right to enter the
hallway of the B building. In the hallway, turn right again, and B-106 is
there.
*Speaker*: Beatriz Olmos (Nottingham)
*Title: *Relaxation of interacting quantum many-body systems under purely
dissipative dynamics
*Abstract: *We study the relaxation dynamics of quantum interacting
many-body systems that undergo purely dissipative dynamics but with
non-classical jump operators that can establish quantum coherence. To gain
a general understanding of the difference between the resulting dynamics
with respect to that of classical rate equations we introduce a class of
interacting quantum spin systems inspired by classical kinetically
constrained models, which are widely used in the context of glass physics.
The adequate choice of the jump operators here ensures that the values of
diagonal observables such as the excitation density coincide in equilibrium
with the classical ones, while the complex relaxation dynamics is a result
of the intricate interplay between the non-classical jumps and the
non-Hermitian time-evolution in the periods between them. Moreover, we show
that the relaxation time of the coherences in these systems can be orders
of magnitude longer than the one of the diagonal observables. Finally, we
discuss the dynamics of strongly interacting Rydberg atoms under
electromagnetically induced transparency (EIT) conditions. We show that
this physical system --- which is currently under intensive study --- is
indeed in some limit described by a purely dissipative dynamics with
non-classical jump operators. We thoroughly study the stationary state and
relaxation dynamics and analyze the limitations of the use of a classical
rate equation model to capture the non-equilibrium behavior of this system.
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