QUROPE Quantum Information Processing and Communication in Europe

Quantum Communication, Quantum Memories, Quantum Metrology

The group "Quantum Optics, Quantum Nanophysics and Quantum Information" is internationally highly competitive in various quantum research areas covering experimental and theoretical research in foundations of quantum physics, quantum optics, quantum information, strongly correlated quantum systems as well as molecular quantum nanophysics.

The Centre aims to foster new collaborations across all areas of quantum
theory, and in particular their applications to emerging quantum
technologies.
The research focus of the affiliated staff is wide-ranging,
covering various application areas: quantum communications,
sensing, imaging and computing technologies and quantum thermodynamics.

We study the nonequilibrium dynamics of correlations in quantum lattice models in the presence of long-range interactions decaying asymptotically as a power law. For exponents larger than the lattice dimensionality, a Lieb-Robinson-type bound effectively restricts the spreading of correlations to a causal region, but allows supersonic propagation. We show that this decay is not only sufficient but also necessary.

In general, a quantum measurement yields an undetermined answer and alters the system to be consistent with the measurement result. This process maps multiple initial states into a single state and thus cannot be reversed. This has important implications in quantum information processing, where errors can be interpreted as measurements.

 M. Lubasch (P3 MPQ) seminar "Classical and quantum simulation of strongly correlated fermions"

With the advent of the end of the second year of the project duration, we publish the overall summary of work:
QESSENCE Year 2 - Summary, 03.2012

Project Coordinator