Dear quanta,
A reminder that we will meet in room 6-310 at 11am for our group meeting,
where David Shukur will tell us about quasiprobabilities, and then at
1:30pm we will have a talk in 6C-442 by Soonwon Choi (info below).
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Soonwon Choi, Berkeley
Friday, February 7. 1:30 pm. 6C-442 (Cosman Room)
Title: Phase transitions in the dynamics of quantum information
Abstract:
Quantum information science seeks to understand and control quantum systems
with high entanglement and complexity, defining a new frontier of physics.
In this talk, we discuss a novel phenomenon that arises in this regime: a
phase transition in the dynamics of quantum entanglement and information.
We consider a generic quantum many-body system coupled to a noisy
environment, which we model with random unitary circuits interspersed by
projective measurements. The interplay between unitary evolution and
measurements leads to a phase transition: at high measurement rates, any
coherent information in the system is completely lost, while at
sufficiently low rates, an extensive amount of information is robustly
protected. The nature of the phase transition can be understood from two
complementary perspectives: firstly, by using the quantum error-correcting
properties of scrambling unitary dynamics; and secondly, by using a mapping
to ordering transitions in classical statistical mechanics. The
implications of our work for on-going experiments as well as for broad
future research directions will be discussed.
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