Condensed matter physics is the branch of physics that studies systems of very large numbers of particles in a condensed state, like solids or liquids. Condensed matter physics wants to answer questions like: why is a material magnetic? Or why is it insulating or conducting? Or new, exciting questions like: what materials are good to make a reliable quantum computer? Can we describe gravity as the behavior of a material? The behavior of a system with many particles is very different from that of its individual particles. We say that the laws of many body physics are emergent or collective. Emergence explains the beauty of physics laws.
Format results
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The reactivity of quantum experiments
Thomas Schuster - California Institute of Technology (Caltech)
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The Physics of Computation with qLDPC codes
Vedika Khemani
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Probing 2D invertible phases with replica permutations
Michael Levin
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Non-perturbative constraints on phase diagrams of non-equilibrium systems
Tarun Grover - University of California, San Diego
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Strong-to-weak $U(1)$ Symmetry Breaking in Open System Dynamics
Matthew Fisher - University of California, Santa Barbara
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Quantum Machine Learning
Quantum Machine Learning -
4 Corners Southwest Ontario Condensed Matter Symposium
4 Corners Southwest Ontario Condensed Matter Symposium -
From the theory of gapless boundaries of 2+1D topological orders to topological Wick rotation
Liang Kong - Harvard University
In this talk, I will review the unified mathematical theory of gapped and gapless boundaries of 2+1D topological orders developed in arXiv:1705.01087. As a consequence of this theory, we will derive a surprising result called “topological Wick rotation”, which was proposed to generalize to higher… -
Heisenberg picture simulation of two-dimensional dynamics and its compression
Juan Carrasquilla - ETH Zurich
I will discuss our recent work on simulating and compressing the out-of-equilibrium dynamics of two-dimensional quantum systems using Pauli propagation techniques. In particular, I will discuss compression strategies based on quantum machine learning that offer significant reduction in gate count… -
The reactivity of quantum experiments
Thomas Schuster - California Institute of Technology (Caltech)
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Strongly symmetric Lindbladians: phases, constraints & transitions
Carolyn Zhang
We present simple toy models of mixed state phases and phase transitions beyond thermal transitions, observed from the steady state structure of strongly symmetric local Lindbladians. To diagnose these mixed state phases and phase transitions, we introduce a local marginal fidelity that serves as a… -
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Braided Fusion Complexes: An Algebraic Theory of Gapped Abelian Phases
I will introduce the notion of a braided fusion complex --- a mathematical structure designed to encapsulate the universal fusion and braiding data of abelian excitations of gapped quantum phases. This structure provides a framework for characterizing and classifying fracton phases of matter. -
Probing 2D invertible phases with replica permutations
Michael Levin
I will discuss a class of probes of 2D invertible phases of matter based on replica permutation operators. These probes are defined by introducing multiple replicas of a many-body system and evaluating expectation values of permutation operators acting in different spatial regions. A notable example… -
Non-perturbative constraints on phase diagrams of non-equilibrium systems
Tarun Grover - University of California, San Diego
In this talk I will discuss constraints on renormalization group (RG) flows and the stability of phases in nonequilibrium systems using information-theoretic inequalities, with examples drawn from both quantum and classical settings. The central quantity underlying these constraints is the… -
Strong-to-weak $U(1)$ Symmetry Breaking in Open System Dynamics
Matthew Fisher - University of California, Santa Barbara
n generic open quantum systems, universal dynamical processes tend to exhibit classicality - dissipation washes out quantum effects. Here I consider open quantum dynamics in the presence of a global U(1) symmetry. In mixed states, this symmetry can be either strong or weak, and distinct dynamical…