Postdoc in Digital-Signal-Processing for Continuous-Variable Quantum Key Distribution - DTU Physics

Are you passionate about working at the absolute forefront of technology? Explore the frontier of continuous-variable quantum key distribution (CV-QKD) – a revolutionary approach to secure communication that blends quantum physics with familiar telecom technology. 

Continuous-variable quantum key distribution (CV-QKD) offers unique advantages for the distribution of secret keys between two parties for data encryption. Utilizing components similar to standard telecom components makes it an attractive solution for cost-effective and high-performance metropolitan applications. Technology exhibits significant parallels with coherent optical telecommunication. However, noise is absolute crucial, as it is attributed to an eavesdropper, therefore presenting exciting challenges and opportunities. 

Within this position you will advance digital-signal-processing techniques for coherent and squeezed state CV-QKD by developing new algorithms and by evaluating them in simulations and in experiments.

The position will be hosted by the Section of Quantum Physics and Information Technology (QPIT) at the Department of Physics of the Technical University of Denmark (DTU). We are a dynamic, innovative and diverse research team focused on all aspects of CV-QKD. Our team is passionate about advancing secure communication methods based on quantum physics and bringing quantum key distribution to the people. We have a wide range of academic and industry collaborations, e.g. as part of the EU Flagship on quantum technology and the European Quantum Communication Infrastructure.

Responsibilities and qualifications
We are looking for a highly motivated candidate who will conduct research in advanced digital signal processing techniques for continuous-variable quantum key distribution by developing new algorithms and performing experimental evaluation. In this role you will:

• Conduct research on digital signal processing algorithms towards high-speed CV-QKD
• Develop new methods for e.g. clock and phase recovery that support real-time high-speed implementations
• Use machine learning to improve discrete modulation formats
• Develop MATLAB or python code
• Experimentally demonstrate the developed algorithms and methods to evaluate their performance

You have a passion for digital-signal-processing algorithms for coherent telecommunication systems, and you are intrigued by its application in continuous-variable quantum key distribution. You enjoy finding clever solutions to difficult problems and possess the following qualifications:

• Experience with modern digital signal processing techniques for optical telecommunication or continuous-variable quantum key distribution, e.g. matched-filtering, phase recovery, clock recovery, polarization equalization, etc.
• Experience with python or MATLAB programming
• Experience with version control systems (e.g. Git)
• Hand-on experience with fiber optic setups
• You thrive by working in a diverse and multidisciplinary team of people 

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 period of employment is 2 years.  

You can read more about career paths at DTU here.

Further information
Further information may be obtained from Associate Professor Tobias Gehring, tobias.gehring@fysik.dtu.dk.

You can read more about DTU Physics at www.physics.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 21 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.

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.