Publication highlights
Inter-site collaboration demonstrates wavelength conversion of single photons emitted by semiconductor quantum dots
Inter-site collaboration demonstrates wavelength conversion of single photons emitted by semiconductor quantum dots ML4Q researchers from Bonn and Jülich have published recent results in Optics Letters on wavelength conversion at the single-photon level - a...
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
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...
Nature Reviews Physics: Oliver Breunig and Yoichi Ando review opportunities of topological insulator devices
Topological insulators hold promise as a platform for unique quantum phenomena. However, realizing these phenomena experimentally requires sophisticated devices. In a Technical Review in Nature Reviews Physics, ML4Q spokesperson Yoichi Ando and ML4Q associated member...
New insights in thin topological insulator films published in Advanced Quantum Technologies
Several scientists around ML4Q members, Bert Voigtländer, Stefan Tautz and Detlev Grützmacher, at Forschungszentrum Jülich have succeeded in taking an important step towards the realization of novel electronic components. Using a special four-tip scanning tunneling...
Topologically interesting through a bit more of Manganese – new publication in Advanced Materials
In a coordinated work with Gunther Springholz (Johannes Kepler University, Austria) and Oliver Rader (Helmholtz Zentrum Berlin for Materials and Energy), ML4Q member Markus Morgenstern at RWTH Aachen published the results of recent work on ferromagnetic topological...
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...
Results of joint work between the Kennes and Trebst groups published in Nature Communication
ML4Q researchers from Aachen (Kennes group) and Cologne (Trebst group) have published with colleagues from Hamburg and the US a Nature Communications paper on the collective behavior of twisted bilayer MoS2 in the presence of interactions. In the study, the authors...
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...
New publication: Spin-valley coupling in single-electron bilayer graphene quantum dots
The 2D Materials and Quantum Devices Group published new results on low-energy single-electron spectra in bilayer graphene quantum dots. Publication: Banszerus, L., Möller, S., Steiner, C. et al. Spin-valley coupling in single-electron bilayer graphene quantum dots....
Science Advances: Reappearance of first Shapiro step in narrow topological Josephson junctions
Science Advances: Reappearance of first Shapiro step in narrow topological Josephson junctions The state of a topological quantum bit is defined by the arrangement of two Majorana zero modes in space and time. In condensed matter, these quasiparticles thatconstitute...
New paper in Science – A new phase transition in the Bose-Einstein condensate now observed
ML4Q researchers from the groups of Martin Weitz and Johann Kroha in Bonn have published a Science paper on their new observation of a new phase transition of a photon Bose-Einstein condensate. 10 years after discovering the Bose-Einstein condensate, the researchers...
New insights into multipartite quantum communication published in Physical Review Research
ML4Q PhD student, Giacomo Carrara, published his first paper related to his work supervised by Gláucia Murta in the group of Dagmar Bruß. The group investigates the role of entanglement for the generalization of quantum key distribution to the multipartite scenario....
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...
A new superconducting circuit could accelerate the realization of a fault-tolerant quantum computer
New theoretical work from the group of David DiVincenzo proposes a scheme to circumvent the necessity of active qubit stabilization and enable highly efficient hardware for future large-scale quantum processors. Congratulations to the authors! Together with colleagues...
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
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
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
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
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...
New cross-site paper on chaotic fluctuations in superconducting transmons
Three cluster members joined efforts to discuss chaotic fluctuations in superconducting transmons. In their recent paper (https://arxiv.org/abs/2012.05923), the authors from the groups of Simon Trebst, Alexander Altland and David DiVincenzo investigate the possibility...
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!
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 Wurtzite GaAs Nanowires Grown by Self-Catalyzed Selective Area...
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...
Paper accepted for publication in Nature Communications
In Fedorova et al., Nature Communications published the latest results of the groups of Hans Kroha and Stefan Linden within Focus Area 4.1.
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...