Quantum Optics Group (LMU) - Quantum Many Body Systems Division (MPQ)

QUANTUM – Research

Understanding interacting quantum many body system and engineering and exploiting such quantum systems for quantum information purposes or quantum simulations pose some of the most outstanding challenges in quantum physics.

Our research focusses on realizing and controlling such systems using ultracold atomic or molecular quantum gases. Starting with ultracold gases of degenerate quantum matter of bosons or fermions held in optical and magnetic traps, we e.g. impose crystals of light on top of the atoms in order to trap them in controlled periodic potentials. Such arrays can serve as versatile model systems for condensed matter physics, or as useful quantum information processors and effective setups for precision atomic and molecular physics measurements.

Furthermore, our group investigates the possibility of forming interfaces between the these many-body systems and light in order to generate novel non-classical light sources and quantum memories for light.

Selection of Current Research Projects

Ultracold bosons in optical superlattices

Using ultracold bosons in optical superlattice potentials, we aim at realizing minimal versions of topologically ordered quantum phases. Such phases with topological order cannot be classified by an order parameter and represent a new class of many-body systems without local order.


Ultracold Fermions in Optical Lattices

We use fermionic 40K atoms to study the dynamics of highly excited many-body systems. In particular, we investigate thermalization properties of interacting and disordered systems, which feature a new phase of matter, called many-body localization (MBL).


Ultracold atoms in a honeycomb optical lattice

In this experiment, we use ultracold atoms in a graphene-like honeycomb lattice to realize a clean and highly tunable system in which to probe topological effects that are difficult to study in solid state systems.


Single-site Detection and Manipulation in Optical Lattices

We spatially resolve and manipulate ultracold atoms in an optical lattice. Addressing of individual lattice sites is achieved through a high resolution optical imaging system, which allows for the detection and manipulation of cold atoms with sub-wavelength resolution.


A Lithium Quantum Gas Microscope

Our projects aims to achieve single site resolved detection of fermionic atoms in optical superlattices. We make use of the light mass of lithium and choose a large scale optical lattice that reduces the demands on the optical detection system.


Ultracold Ytterbium in optical lattices

This new setup uses Ytterbium atoms to generate quantum gases with novel properties. These atoms have a more complex internal structure than Alkali atoms, which allows for state-dependent interaction with light and other atoms.


Polar molecules - A Quantum Gas with Long-range Interactions

In this experiment we aim to create a strongly interacting gas with long range interactions. Polar ground state molecules in an external fields provide tuneable dipolar interaction. .


Ultracold Strontium at MPQ

In April 2015, we started a new lab with the aim of studying many-body quantum physics with ultracold strontium atoms in optical lattices. Our lab is located at the Max-Planck-Institute for Quantum Optics in Garching.


A Caesium Quantum Gas Microscope

In July 2017, we started the new Caesium lab to study topological many-body phases of matter. We will make use of state-dependent lattices to engineer artificial gauge fields and use the unique possibilities offered by high-resolution imaging techniques to prepare and investigate many-body phenomena in these lattices.