“Complex” quantum systems under control

While a longstanding subject in different areas of physics, the quantum dynamics of “complex” systems has recently moved back into focus, not least due to remarkable progresses in the experimental characterisation and control of multi-component quantum systems. Whereas quantum optics had long followed a strictly reductionist program, with the aim to isolate and control single constituents of matter, we now can witness how “complex” phenomena rapidly emerge as moderate numbers of these constituents are brought together again, at an unprecedented level of control. 

On a practical level, e.g., entangled states of light are identified as potential information carriers for quantum communication across turbulent media, multiply connected ensembles of qubits are configured into “prototype quantum computers” - which permit nice experimental demonstrations of the actual challenge to control their long- time evolution -, and “quantum simulations” are performed on cold matter platforms.

This novel experimental playground raises beautiful theoretical problems, such as how “complexity” can be quantified, to which extent “complex” quantum dynamical phenomena can be controlled, and how targeted performance can be reliably certified. Starting out from by now historical examples of “complex" quantum systems, the talk will subsequently expand on some current topics in the area of many-particle quantum transport in optical lattices, with an emphasis on spectral and eigenstate properties, and on the theoretical modelling of many-particle transport phenomena between finite reservoirs.

Transmisión en vivo de la videoconferencia vía YouTube: bit.ly/YouTube_ICF 

Participante: Dr. Andreas Buchleitner

Institución: Universität Freiburg, Alemania

Fecha y hora: Este evento terminó el Miércoles, 09 de Diciembre de 2020