Quantum Phase Transitions Through Quantum Information Window by Aditi De

Explore quantum phase transitions through the lens of quantum information in this 51-minute colloquium talk. Delve into the role of bipartite and multipartite entanglement as detectors of quantum phase transitions in many-body systems. Examine recent investigations on dynamical quantum phase transitions and how entanglement can detect these phenomena. Learn about the theory of entanglement, two-party paradigms, and mixed states. Discover experimental achievements in ultracold atoms and superconducting qubits. Investigate quantum spin models, including ATXY and DATXY models, and their quantum phases. Understand the concept of dynamical quantum phase transitions and methods to detect them. Analyze results showing entanglement measures as powerful as rate functions in detecting these transitions. Gain insights into the potential of quantum spin models for realizing information processing tasks and their experimental implementations.

Date:Mon, 17 June 2019, 15:00 to
Quantum phase transitions through quantum information window
Outline
Theory of Entanglement
Two-party-paradigm
Mixed States Separable/Useless states
However, for two spin-I/2 particles
Why shud we study?
Experimental Achievements: 2017-18
Ultracold atoms Superconducting quits
Why shud we study quantum spin models
Motivation: Quantum information perspective
Study fundamental properties by using quantum info or vice-versa
Potential candidate for realising information processing tasks
Implementation: Proposals
Implementation: Experiments
Quantum Spin Model
ATXY model Quantum phases
Ent in ATXY model
Factorization Surfaces
Quantum Spin Model 2
DATXY model Quantum phases
Entanglement patterns
What is dynamical quantum phase transition?
How to detect DQPT?
Rate function for Ising model: Experiment
Rate Function detects DQPT: Result 1
Result 2
Result 3: Ent measure as powerful as rate function
Summary
QIC group @ HRI: Past & Present