Publication highlights

Extremely compressible “gas of light”

Extremely compressible “gas of light”

Busley et al. bring these advantages to quantum gases of light and explore a textbook scenario: a two-dimensional, spatially uniform gas of bosons.[from Photons think inside the box, Perspective, Science 375 (6586), pp. 1355-1356, 2022]The group of Martin Weitz...

Observing the difference between quantum and classical causality

Observing the difference between quantum and classical causality

In an international multi-site cooperation, scientists from the ML4Q Cluster of Excellence are able to observe quantum effects in cause and effect relationship in a photonic experiment. Understanding causal relationships in the observed data is a deeply rooted concept...

New publication in Physical Review X by the Diehl group

New publication in Physical Review X by the Diehl group

Effective Theory for the Measurement-Induced Phase Transition of Dirac Fermions The recent discovery of a novel type of phase transition - driven by the competition between a quantum system’s internal evolution and its external observation - has sparked significant...

New paper in Quantum Science and Technology

New paper in Quantum Science and Technology

In their recent publication, David DiVincenzo and Cica Gustiani report on new findings concering  blind oracular quantum computation (BOQC) schemes. They present an optimized BOQC scheme which possesses the same security as BOQC and is runnable with minimal physical...

Köhl group realizes quantum network node

Köhl group realizes quantum network node

The group of Michael Köhl succeeded in implementing a special interface between light and matter. In npj Quantum Information they report the realization of a quantum network node using a trapped ion inside a fiber-based Fabry–Perot cavity. They show the generation of...

New paper in Nature Communications

New paper in Nature Communications

ML4Q researchers from the Ando lab and the group of Achim Rosch as well as cooperating partners from the Department of Physics at the University of Basel and the Institute for Physical Chemistry at the University of Cologne have published a Nature Communications paper...

New insights on twisted van der Waals materials in Nature Physics

New insights on twisted van der Waals materials in Nature Physics

Together with researchers from the Max Planck Institute for Structure and Dynamics of Matter in Hamburg, the Flatiron Institute, Columbia University, and the Max Planck - New York City Center for Non-equilibrium Quantum Phenomena, Dante Kennes published results on the...

New PRX Quantum paper on multiparty device-independent cryptography

New PRX Quantum paper on multiparty device-independent cryptography

ML4Q researchers led by Dagmar Bruss at HHU Düsseldorf have published recent results on multipartite device-independent (DI) protocols showing tight security proofs of DI conference key agreement and DI randomness generation protocols. Congratulations to all the...

Compact, stable and color-tunable – news from the ML4Q Fiber Lab

Compact, stable and color-tunable – news from the ML4Q Fiber Lab

In Optics Express, scientists led by Dieter Meschede report on building optical fiber filters that are not only extremely compact and stable, but also color-tunable. Optical resonators or filters are important components cutting out very narrow spectral lines from...

New Nature paper on competing magnetic orders

New Nature paper on competing magnetic orders

ML4Q researchers from Bonn have published a Nature paper on competing magnetic orders in a bilayer Hubbard model with ultracold atoms - congratulations to all the authors on their impressive results! Details can be found in the press release. Publication: Marcell...

Congratulations to David Wierichs on his first author publication!

Congratulations to David Wierichs on his first author publication!

Avoiding local minima in variational quantum eigensolvers with the natural gradient optimizer is the title of a recent publication in Focus Area 3.2. In the paper, David Wierichs (PhD student at the Institute for Theoretical Physics Cologne), Christian Gogolin...

Congratulations to Marvin Jansen on his first publication!

Congratulations to Marvin Jansen on his first publication!

Marvin M. Jansen, PhD student in the group of Alexander Pawlis at PGI-9 of the Forschungszentrum Jülich, successfully published his findings in ACS Appl. Nano Mater. His work entitled "Phase-Pure Wu​rtzite GaAs Nanowires Grown by Self-Catalyzed Selective Area...

New publication in Nature Communications

New publication in Nature Communications

In a joint work between the Kroha group (core project 4.1), the Kirchner group (Zhejiang Institute of Modern Physics and Department of Physics, China) and the Lin group (National Chiao Tung University, Taiwan), new findings were reported in Nature Communications. The...

Irreversible splitting of light

Irreversible splitting of light

​In a combined effort of the research groups of Martin Weitz and Achim Rosch within Focus Area 4, new findings were published in Science. Kurtscheid et al. introduce a method of irreversibly, but coherently, populating a split state with photons by thermalizing the...