Calendar

< 2022 >
June 26 - July 02
«
»
  • 26
    June 26, 2022
    No events
  • 27
    June 27, 2022
    No events
  • 28
    June 28, 2022
    No events
  • 29
    June 29, 2022
    No events
  • 30
    June 30, 2022

    CMSA Interdisciplinary Science Seminar: Entanglement and its key role in quantum information

    9:00 AM-10:00 AM
    June 30, 2022
    Entanglement is a type of correlation found in composite quantum systems, connected with various non-classical phenomena. Currently, entanglement plays a key role in quantum information applications such as quantum computing, quantum communication, and quantum sensing. In this talk the concept of entanglement will be introduced along with various methods that have been proposed to detect and quantify it. The fundamental role of entanglement in both quantum theory and quantum technology will also be discussed.
     
    Bio: Spyros Tserkis is a postdoctoral researcher at Harvard University, working on quantum information theory. Before joining Harvard in Fall 2021, he was a postdoctoral researcher at MIT and the Australian National University. He received his PhD from the University of Queensland.

    For information on how to join, please go to: https://cmsa.fas.harvard.edu/interdisciplinary-science-seminar

     

     

     

    CMSA Quantum Matter in Mathematics and Physics: Boundary conditions and LSM anomalies of conformal field theories in 1+1 dimensions

    8:30 PM-10:30 PM
    June 30, 2022

    In this talk, we will study a relationship between conformally invariant boundary conditions and anomalies of conformal field theories (CFTs) in 1+1 dimensions. For a given CFT with a global symmetry, we consider symmetric gapping potentials which are relevant perturbations to the CFT. If a gapping potential is introduced only in a subregion of the system, it provides a certain boundary condition to the CFT. From this equivalence, if there exists a Cardy boundary state which is invariant under a symmetry, then the CFT can be gapped with a unique ground state by adding the corresponding gapping potential. This means that the symmetry of the CFT is anomaly free. Using this approach, we will systematically deduce the anomaly-free conditions for various types of CFTs with several different symmetries. When the symmetry of the CFT is anomalous, it implies a Lieb- Schultz-Mattis type ingappability of the system. Our results are consistent with, where available, known results in the literature. Moreover, we extend the discussion to other symmetries including spin groups and generalized time-reversal symmetries. As an application, we propose 1d LSM theorem involving magnetic space group symmetries on the lattice. The extended LSM theorems apply to systems with a broader class of spin interactions, such as Dzyaloshinskii-Moriya interactions and chiral three-spin interactions.

    https://harvard.zoom.us/j/977347126
    Password: cmsa

  • 01
    July 1, 2022
    No events
  • 02
    July 2, 2022
    No events