Postdoc in Quantum Photonics - DTU Electro

Join us as a postdoc researcher to advance quantum photonics on the integrated lithium niobate-on-insulator (LNOI) platform. Contribute to groundbreaking research in quantum communication and cybersecurity.
Are you passionate about quantum photonics and eager to contribute to groundbreaking research? We offer an exciting opportunity for a postdoc researcher to work on squeezed light sources using the integrated lithium niobate-on-insulator (LNOI) photonics platform at the Technical University of Denmark (DTU)!

About the Project
Squeezed light sources are essential for quantum photonic technologies, including quantum communication, quantum computing, and quantum metrology. While traditionally achieved using bulk optics, integrated photonics offer significantly greater potential due to strong light-matter interaction in highly confined nonlinear waveguides. This approach is directly compatible with integrated quantum photonic systems. LNOI is an ideal material system for integration, thanks to its strong second-order nonlinearity and ability to be poled for precise phase matching.

This postdoc project, part of the Innovation Fund Denmark (IFD) Grand Solutions project “Advancing cybersecurity with continuous variable quantum cryptography” (CyberQ), will focus on developing highly squeezed light sources on the LNOI platform for quantum communications. You will design waveguides on periodically poled lithium niobate (PPLN) for squeezed state generation. Ultra-low loss PPLN waveguides will be fabricated in our state-of-the-art cleanroom at DTU Nanolab (formerly DTU Danchip). You will also investigate ultra-low loss fiber-to-chip couplers, aiming to achieve record-performance fiber-coupled squeezed light sources. Additionally, you will have the opportunity to collaborate with other project partners from both academia and industry.

The postdoc project will be associated with the High-Speed Optical Communications group (HSOC) at the Department of Electrical and Photonics Engineering at DTU Electro. The HSOC group is at the forefront of international research in integrated silicon and lithium niobate quantum photonics, on-chip quantum information processing, and high-dimensional quantum communication technologies. The HSOC group encourages collaborative work and offers an informal working environment. You will have access to on-site and state-of-the-art experimental and cleanroom facilities.

Responsibilities
As a postdoc researcher, you will:

• Design PPLN waveguides for efficient nonlinear processing.
• Fabricate ultra-low loss PPLN waveguides for light squeezing.
• Develop ultra-low loss fiber-to-chip couplers on the LNOI platform.
• Characterize squeezed light sources using state-of-the-art lab facilities.

Qualifications:

• PhD degree or equivalent in a relevant field.
• Experience in nonlinear photonics, quantum optics, and nanofabrication technology.
• Strong self-motivation and excellent communication skills in English.

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 period of employment is 2 years. The start date would be 1 July 2025 or at soon as possible thereafter.

You can read more about career paths at DTU here.

Further information
Further information may be obtained from Prof. Leif K. Oxenløwe (lkox@fotonik.dtu.dk) or Senior Researcher Yunhong Ding (yudin@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 30 April 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.

DTU Electro has 340 employees and span activities in physics, photonics, and electrical engineering. Research is performed within nanophotonics, lasers, quantum photonics, optical sensors, LEDs, photovoltaics, ultra-high speed optical transmission systems, and bio-photonics.

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.

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