Center For Quantum Devices

14/02/2025

We’re thrilled to share our latest research, "A quantum dot in germanium proximitized by a superconductor," now published in Nature Materials!

Our team has developed a cutting-edge quantum dot in a Ge/SiGe heterostructure, coupled with a superconducting platinum germanosilicide (PtSiGe) lead. This breakthrough allows for precise tuning of quantum properties, including controlling coupling strength, switching ground states, and exploring spin-split sub-gap physics. The results open new doors for superconducting and spin-based qubits, as well as Josephson junction arrays—pushing quantum computing and topological superconductivity forward!

Read the article here: https://www.nature.com/articles/s41563-024-02095-5

Additionally, Ilan T. Rosen has written a News & Views piece summarising and discussing the broader implications of our findings and their impact on the future of quantum devices.

The authors achieve gate-controlled proximitization of a quantum dot in a planar germanium heterostructure, an isotopically purifiable group IV material. A patterned Pt germanosilicide superconductor is introduced via a thermally activated reaction.

12/02/2025

From our Quantum Matter group, now out on Phys Rev X via American Physical Society: "Hybrid Josephson Rhombus: A Superconducting Element with Tailored Current-Phase Relation".

In this work, we introduce the hybrid Josephson rhombus, a superconducting circuit with highly tunable current-phase relations. By combining magnetic frustration and gate-voltage control, we achieve deterministic tuning of its harmonic content. From charge-4e transport to tuning a superconducting diode, read the whole paper here:

A circuit containing four superconducting devices called Josephson junctions can be finely tuned for various technological applications.

17/10/2024

We have an open postdoctoral fellowship at the Center for Quantum Devices, right at the center of all the academic activities: teaching, scientific writing, and research! The goal is to develop solid-state quantum technologies for practical quantum education.
The position is open from 01 February 2025 or as soon as possible, and runs for 1 year, with a possibility of extending the contract further.
Details regarding the position and application can be found here:

The Center for Quantum Devices at the Niels Bohr Institute, University of Copenhagen, invites applicants for a postdoctoral fellowship focused on developing solid-state quantum technologies for practical quantum education and quantum workforce training. The successful candidate will be an integral p...

23/05/2024

We are excited to announce that the Center for Quantum Devices at the Niels Bohr Institute is part of the Ferromon consortium, selected by the European Union as a Pathfinder initiative in quantum computation.

In collaboration with Qblox, Università degli Studi di Napoli Federico II, QuantWare, and QuantrolOx, this project aims to advance the European scientific and industrial capabilities by introducing an innovative superconducting qubit for the development of quantum computers.

Read more: https://ferromon.eu/
Follow our project: https://www.linkedin.com/company/ferromon/about/

EU Horizon 2020 collaborative research project for breakthrough results

23/04/2024

Now out on arXiv from our Spin Qubit team: "Physics-informed tracking of qubit fluctuations"

In this work, a novel physics-informed and real-time Hamiltonian estimation protocol is applied to quantum bits. This protocol estimates the fluctuating environment of a spin qubit (a nuclear spin bath) on-the-fly on a quantum controller, by updating its probability distribution according to the model describing the nuclear spins (Fokker-Planck equation). It is further improved by adaptively choosing the probing time of the qubit, based on the previous measurement outcomes, to maximize the information gathered per measurement.

Read more: https://arxiv.org/abs/2404.09212

18/03/2024

Last week, we hosted a workshop on superconductor/semiconductor hybrid materials at the Center for Quantum Devices - just around the corner from Niels Bohr’s historical office.

We are looking back to three successful days of countless lively discussions and 17 wonderful talks covering topics from the physics of a grandfather’s clock to novel superconducting qubits.

We would like to thank everyone who participated in the workshop and made it a great success!

The workshop was hosted by the ERC Synergy project NONLOCAL.

21/11/2023

QDevil, which span out of QDev in 2016, will be awarded the "Technology Transfer Prize 2024” from the German Physical Society.

Congratulations to Karen, Rikke, Jan and Ferdinand!

Watch their video here: https://nbi.ku.dk/english/news/news23/nbi-spin-out-enterprise-receives-prestigious-tech-transfer-award/

08/10/2023

Faculty positions in MSE, including Quantum Science and Engineering, just announced. Apply, if you are looking for a faculty position.

The Materials Science & Engineering Department at the University of Washington has a tradition of interdisciplinary collaborations and strong partnerships with other academic institutions, the national labs, and industry. Major areas of research include biomedical imaging, biomimetics, drug delivery...

20/09/2023

We are seeking outstanding candidates for a PhD position to work on experimental condensed matter based quantum-simulation platforms at the Center for Quantum Devices.

The position is open from 1 March 2024 or as soon as possible thereafter.

Details regarding the position and application can be found here: https://employment.ku.dk/phd/?show=160117

Deadline for application is 15 October 2023.

19/09/2023

Reminder: deadline for applications for the following PhD fellowship is 30 September 2023, 23:59 GMT +2.

We seek outstanding candidates for a PhD Fellowship to work in the Experimental Aspects of Non-Local Condensed Matter Physics at the Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen.

The position is open from 1 March 2024 or by arrangement.

More information regarding the position can be found here: https://lnkd.in/eF33Gr7n

19/09/2023

We are pleased to announce that Center Director Charles Marcus has been selected to serve as InstituteQ Chair of Excellence from 2023-2025.

You can learn more about his work, motivation, and visions in the Q&A:
https://instituteq.fi/meet-your-instituteq-chairs-of-excellence-professors-simon-devitt-charles-marcus/