Events at Physics
Events on Tuesday, January 31st, 2023
- R. G. Herb Condensed Matter Seminar
- Locality, universality, and quantum dynamics with measurements
- Time: 10:00 am
- 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
- Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
- High-Energy Multimesssenger Emission from Supermassive Black Holes
- Time: 2:00 pm
- Place: Join Zoom Meeting Meeting ID: 912 3071 4547
- Speaker: Kohta Murase, Penn State
- Abstract: Supermassive black holes power disks, coronae, jets and winds, and a significant fraction of energy released by the black holes may be carried by cosmic rays and associated high-energy non-thermal radiation. Recently, the IceCube Collaboration reported associations of high-energy neutrinos with active galactic nuclei, including a nearby Seyfert galaxy, NGC 1068. We review the implications of the multimessenger data for theoretical models and discuss their challenges.
- Host: Baha Balantekin