R. G. Herb Condensed Matter Seminars |
Events During the Week of January 29th through February 5th, 2023
Monday, January 30th, 2023
- No events scheduled
Tuesday, January 31st, 2023
- Locality, universality, and quantum dynamics with measurements
- Time: 10:00 am - 6:00 pm
- Place: 5310 Chamberlin
- Speaker: Aaron Friedman, UC Boulder
- Abstract: I will present a recently developed formalism for quantum measurements that is both technically powerful and conceptually transparent. This framework is the basis for new results based on condensed matter principles like locality and universality that were not previously thought possible—including extending the Lieb-Robinson Theorem to dynamics with measurements and proving deep connections between measurement-based quantum computation and topological order. In contrast to the conventional wisdom that measurements destroy locality, we find a maximum enhancement to the speed of quantum information in measurement-assisted protocols, establishing a precise notion of locality. I’ll discuss the formal resolution to the EPR paradox, constraints on quantum teleportation, error correction, routing, and the preparation of useful resource states (e.g., Bell, GHZ, Dicke, and squeezed states). I’ll present optimal quantum protocols that achieve these tasks, reveal new resource tradeoffs, and discuss important implications for measurement-based quantum computing and its fundamental connection to symmetry-protected topological order. Finally, I'll comment on other applications relevant to condensed matter and future applications of this work.
- Host: Victor Brar
Wednesday, February 1st, 2023
- No events scheduled
Thursday, February 2nd, 2023
- Emergence of Quantum Order
- Time: 10:00 am - 6:00 pm
- Place: 5310 Chamberlin
- Speaker: Elio Konig , Max Planck (Stuttgart)
- Abstract: The patterns of self-organization in complex quantum systems are traditionally understood using the concept of spontaneous symmetry breaking. In contrast, quantum order in the absence of symmetry breaking, in particular highly entangled topologically ordered states, describe fundamentally distinct phases of matter which are of great interest both in present-day condensed matter research and in quantum information science. In this talk, I will spend some time reviewing the concepts of topological and non-symmetry broken quantum order. I will then focus on the interplay of such exotic states with gapless fermions, i.e., metals. I will discuss their importance as solid-state realizations of lattice gauge theories, mechanisms in which a Fermi sea stabilizes miniature variants of topological order, and experimental setups in which metallic contacts are used to probe quantum order. I will conclude with an outlook summarizing the multiple synergies of quantum information theory and quantum materials science.
- Host: Victor Brar
Friday, February 3rd, 2023
- No events scheduled