Dear quanta,
We will have group meeting tomorrow at the usual time and place. Besides
Scott's talk today at 4, there are two others that should be of interest to
the group: tomorrow and Monday, both at 1:30pm in 6C-442.
===
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.
====
Guang Hao Low, Microsoft
Monday, February 10, 1:30 pm. 6C-442 (Cosman Room)
Title: Probing strongly correlated systems: Towards a quantum computational
advantage
Abstract:
The properties of strongly correlated systems are of great interest but
have often been challenging to elucidate. Some of these difficulties may be
overcome by programmable digital quantum computers, which harness the
quantum-mechanical nature of reality to simulate quantum systems and
promise an advantage over computers rooted in classical physics. In this
talk, I review developments in quantum algorithms advancing this goal,
highlight the key role of physical insight such as the interaction picture
and the finite speed of light driving recent progress, and point towards
further challenges in quantum computation as a tool for fundamental physics.
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