<!-- ko if: isJobTitleVisible --> Postdocs in Quantum Optics in Silicon Subdiffraction Cavities: Fabrication and Theory - DTU Electro <!-- /ko --> <!-- ko if: isAlreadyAppliedVisible --><!-- /ko -->

The Photonic Nanotechnology group is now expanding the team within quantum and nanoelectromechanical photonics, and we are seeking two highly motivated and independent researchers to join our group. The candidates will join an ambitious international research and innovation project focused on silicon quantum photonics.
The overarching goal of this newly funded project is to realize quantum light sources coupled to quantum memories. Quantum memories are key components of optical quantum computers and scalable quantum networks: They are responsible for the central tasks of storing and processing quantum information. The memories must be optically active so distant nodes in a network can be entangled via single photons emitted by the memories. Erbium in silicon is currently subject to intense worldwide research [Berkman2023, Gritsch2025] because erbium is the only emitter that combines compatibility with semiconductors with long spin coherence time and emission in the low-loss telecom C-band.
We are looking for two postdoctoral researchers, who have excelled in the PhD projects and/or previous postdocs positions to join our team working towards demonstrating chip-scale quantum light sources with embedded quantum memories based on erbium in ultracompact tunable silicon nanocavities. You will be part of a well-funded project that builds on our recent experimental breakthroughs in ultra-small silicon nanocavities [Babar2023, Rosiek2023] with extreme light-matter interactions. We aim to combine fundamental theory, device design, and our unrivalled capabilities in high-resolution silicon nanotechnology towards entering so far uncharted experimental regimes.
Responsibilities and qualifications
The postdocs will work closely with the rest of the group within the framework of EQUAL – Erbium-based silicon quantum light sources, a newly initiated project funded by the Innovation Fund Denmark. The available projects are within the following areas:
Position 1: Spectroscopy on erbium and other quantum light sources in silicon. This will benefit from our state-of-the-art experimental facilities, including cryogenics, which is now under expansion with a new dilution refrigerator. The ideal candidate has significant experience with experimental quantum optics and cryogenics and a solid grasp of theoretical quantum optics.
Position 2: Fabrication, device integration, and characterization of nanoelectromechanical photonic circuits and switches for classical and quantum photonics. A major asset for this project will be DTU’s excellent cleanroom facilities. The ideal candidate has significant experience with nanofabrication of silicon devices as well as experience with optical characterization.
Both candidates are expected to take responsibility for driving ambitious research projects and to co-supervise students and PhD-students.
As a formal qualification, you must hold a PhD degree (or equivalent). 
We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility. 
Salary and terms of employment 
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed upon with the relevant union.
The periods of employment are:

• Position 1: 2 years.
• Position 2: 3 years.

You can read more about career paths at DTU here .
Further information
Further information may be obtained from Professor Søren Stobbe, ssto@dtu.dk .
You can read more about DTU Electro at www.electro.dtu.dk . 
If you are applying from abroad, you may find useful information on working in Denmark and at DTU at DTU – Moving to Denmark .
Application procedure 
Your complete online application must be submitted no later than 25 July 2025 (23:59 Danish time). Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link "Apply now", fill out the online application form, and attach all your materials in English in one PDF file. The file must include:

• Application (cover letter)
• CV
• Academic Diplomas (MSc/PhD – in English)
• List of publications 

Applications received after the deadline will not be considered.
All interested candidates irrespective of age, gender, disability, race, religion or ethnic background are encouraged to apply. As DTU works with research in critical technology, which is subject to special rules for security and export control, open-source background checks may be conducted on qualified candidates for the position.
About the Quantum and Nanophotonics section
The Department of Electrical and Photonics Engineering has nearly 300 employees of which around 200 research different aspects of photonics. Research is performed within nanophotonics, photonic nanotechnology, lasers, quantum photonics, optical sensors, LEDs, photovoltaics, ultra-high speed optical transmission systems, and bio-photonics. The Quantum and Nanophotonics section combines expertise in the synthesis and handling of nanomaterials, the fabrication of nanoscale devices, and theoreticians employing a wide palette of analytical and numerical techniques to provide better understanding of and control over the fundamental properties of light-matter interactions and in this way realizing new nanophotonic devices for emerging information and quantum technology.
Technology for people
DTU develops technology for people. With our international elite research and study programmes, we are helping to create a better world and to solve the global challenges formulated in the UN’s 17 Sustainable Development Goals. Hans Christian Ørsted founded DTU in 1829 with a clear mission to develop and create value using science and engineering to benefit society. That mission lives on today. DTU has 13,500 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. DTU has campuses in all parts of Denmark and in Greenland, and we collaborate with the best universities around the world.
[Babar2023] Babar, A. N., Weis, T. A. S., Tsoukalas, K., Kadkhodazadeh, S., Arregui, G., Vosoughi Lahijani, B. & Stobbe, S. Self-assembled photonic cavities with atomic-scale confinement . Nature 624, 57–63 (2023).
[Berkman2023] Berkman, I. R., Lyasota, A., de Boo, G. G., Bartholomew, J. G., Lim, S. Q., Johnson, B. C., McCallum, J. C., Xu, B.-B., Xie, S., Abrosimov, N. V., Pohl, H.-J., Ahlefeldt, R. L., Sellars, M. J., Yin, C. & Rogge, S. Millisecond electron spin coherence time for erbium ions in silicon . arXiv:2307.10021 (2023).
[Gritsch2025] Gritsch, A., Ulanowski, A., Pforr, J. & Reiserer, A. Optical single-shot readout of spin qubits in silicon . Nature Communications. 16, 64 (2025).
[Rosiek2023] Rosiek, C. A., Arregui, G., Vladimirova, A., Albrechtsen, M., Vosoughi Lahijani, B., Christiansen, R. E. & Stobbe, S. Observation of strong backscattering in valley-Hall photonic topological interface modes . Nature Photonics 17, 386–392 (2023).

• Job Identification 5486
• Job Category VIP B
• Posting Date 07/07/2025, 04:41 AM
• Apply Before 07/25/2025, 05:59 PM
• Locations Ørsteds Plads, Kgs. Lyngby, 2800, DK