Developing Rydberg-atom quantum computers

Rydberg-atom quantum computers Copyright: © Markus Müller

We are excited to be a partner in the new MUNIQC-Atoms collaboration as part of the Munich Quantum Valley Initiative, which aims at developing and implementing quantum processors based on neutral Rydberg atoms. Our theory group will focus on investigating new tailor-made quantum error correction strategies and exploring the physics of this fascinating emerging physical platform - interested in more details and contributing as a postdoc or PhD student? Apply now!


Brisk Rydberg Ions for Scalable Quantum Processors

Brisk Rydberg Ions for Scalable Quantum Processors Copyright: © Markus Müller

We are glad to be part of the new research collaboration BRISQ. Starting in autumn 2022, we will take a novel approach to quantum computing, centred around the only very recently established but highly promising physical platform to host a scalable quantum computer – laser-excited trapped ions in Rydberg states. Interested in more details and joining as a postdoc or PhD student? Apply now!


Fundamental thresholds for noisy quantum error correcting circuits

Understanding the fundamental robustness offered by different quantum error correcting codes is of high practical relevance. In this publication, we explored an intriguing connection between quantum codes and classical statistical mechanics, to map noisy quantum circuits to classical disordered spin models and thereby investigate the fundamental robustness of quantum error correcting codes with noisy circuit components.


Crosstalk error suppression for quantum computing with trapped ions

Crosstalk error suppression Copyright: © Markus Müller

In ion trap quantum computers, one major source of errors can be crosstalk that unwantedly affects neighbouring qubits. How much does this error is tolerable, and how can it be handled to achieve fault-tolerant quantum error correction? See our recent work in Quantum for the answer!


Welcome Friederike Butt, David Scheer and Dmitrii Dobrynin

Friederike, David and Dmitrii are joining our group as master students, to explore new concepts for fault-tolerant quantum error correction and machine-learning-based characterisation and optimisation of quantum processors.


Invited Seminar on Topological Quantum Error Correction

Topological Quantum Error Correction Copyright: © Markus Müller

It was a great pleasure to speak about "Topological Quantum Error Correction: From Theoretical Concepts to Experiments” in the IFIMAC-ICMM Joint Seminar Series in Madrid - the seminar recording is openly accessible here.


Kicking off the new Jülich Quantum Computing Seminar series

Quantum neural networks Copyright: © Markus Müller

Thank you to our master student David Locher, who kicked off the new Jülich Quantum Computing Seminar series with a talk on his ongoing research on quantum autoencoders for error correction.


New Entanglement Certification Technique for Noisy Quantum Error Correction Circuits

New Entanglement Certification Technique Copyright: © Markus Müller

Quantum computers run their algorithms on large quantum registers. It is important to verify that the actual computations on noisy devices lead to quantum correlations of desired quality. In collaboration with colleagues at Swansea and Madrid, we developed a new method, published in PRX Quantum, to efficiently characterise entanglement in noisy quantum error correction circuits.


ML4Q School on Quantum Technology

ML4Q School on Quantum Technology Copyright: © Markus Müller

M. Müller enjoyed teaching on quantum algorithms, quantum error correction and topological codes at this year’s ML4Q School on Platforms for Quantum Technologies.


Welcome Manuel Rispler

Manuel realised his PhD at RWTH Aachen, and after a postdoc in Prof. Terhal’s group at Delft University, he is now joining our group on the EU Quantum Technology project on “Advanced Quantum Computing with Trapped Ions”. Manuel plans to bring in his experience in quantum error correction, fault-tolerant quantum computing and device modelling, to develop new theory techniques and support experimental realisations in near-term quantum error correction.

Manuel started his work from 01st April 2021.


Self-trapped polarons and topological defects in a topological Mott insulator

Protected conducting states in the bulk. Copyright: © Markus Müller

In a recent article published in Physical Review Letters and highlighted as an Editor’s suggestion, a collaboration of researchers Sergi Julià-Farré, Maciej Lewenstein and Alexandre Dauphin from the Institute of Photonic Sciences (ICFO) with Markus Müller from RWTH Aachen University and Forschungszentrum Jülich, reports how an interplay between spontaneous symmetry breaking and global topological properties can lead to new strongly-correlated topological effects, which could be observed in systems of cold laser-excited Rydberg atoms. We invite you to also have a look at the summary of our work.


Mini-Course on Quantum Computation

Summer school Copyright: © Markus Müller

M. Müller very much enjoyed giving an online introductory course on quantum computation at the Escuela de Verano UPB 2020 in Medellín - the lecture videos (Spanish) are openly accessible here:

Part 1

Part 2


Welcome Eliana Fiorelli

Eliana Fiorelli Copyright: © Eliana Fiorelli

Eliana realised her PhD at the University of Nottingham, UK, where she investigated signatures of associative memory in open quantum systems. At Aachen she is joining the ERC Starting Grant project QNets. She plans to bring in her expertise in quantum generalisations of classical neural networks and driven-dissipative open many-body quantum systems, to contribute to the development quantum neural networks in open atomic quantum systems.

Eliana started her work from 05th October 2020.


Lecture on Spatially Correlated Quantum Dynamics

Lecture on Spatially Correlated Quantum Dynamics Copyright: © Markus Müller

Markus Müller is grateful to have given a lecture on "Quantifying Spatial Correlations in General Quantum Dynamics" at this years virtual Autumn School on Correlated Electrons Topology, Entanglement, and Strong Correlations. Feel free to have a look at the presentation and lecture notes.


New method prevents quantum computers from crashing

New method prevents quantum computers from crashing Copyright: © Harald Ritsch

Quantum information is fragile, which is why quantum computers must be able to correct errors. But what if whole qubits are lost? In collaboration with colleagues at the University of Innsbruck and University of Bologna, we developed and experimentally implemented a method published in the journal Nature that allows quantum computers to keep going even if they lose some qubits along the way. We invite you to also have a look at the press release!


FTQT 2020

FTQT 2020 Copyright: © Markus Müller

Markus Müller is grateful to have given the opening talk on "Fighting Qubit Loss in Topological QEC Codes” at this years virtual Fault-Tolerant Quantum Technologies Workshop (FTQT 2020) - the video of this talk and others can be found here.


Welcome Lorenzo Cardarelli

Lorenzo Cardarelli Copyright: © Lorenzo Cardarelli

Lorenzo completed his PhD at the University of Hannover, Germany, where he investigated quantum link models and topological phases in cold atom systems.

At Aachen he is joining the EU Quantum Technology Flagship AQTION project, where he hopes to deploy his expertise in AMO physics and the study of strongly correlated systems to contribute to the development and applications for Europe’s first compact trapped-ion quantum computer demonstrator.

Lorenzo started his work from 01st July 2020.


Welcome Sascha Heußen

Sascha Heußen Copyright: © Sascha Heußen

Sascha completed his Master in Physics at TU Dortmund, on the topic of interaction-induced topological quantum phase transitions, followed by a research stay at Caltech and AI and Machine-Learning-related work in industry.

At Aachen, he starts an ML4Q-funded project on the development of fault-tolerant QEC protocols in solid-state-based quantum information platforms.

Sascha started his work from 01st July 2020.


Welcome Thomas Botzung

Thomas Botzung Copyright: © Thomas Botzung

Thomas completed his PhD thesis at the Universities of Strassbourg and Bologna, investigating one-dimensional strongly correlated systems with long-range interactions.

At Aachen, he joins the ERC Starting Grant project QNets, where he hopes to contribute with his expertise to the development of open-system quantum neural networks and the study of driven-dissipative many-body systems.

Thomas started his work from 01st May 2020.


Congratulations David Amaro

David Amaro Copyright: © Markus Müller

David Amaro receives his PhD on 28th April 2020.

His thesis is entitled Characterization and implementation of robust quantum information processing.