Postdoc in Symmetry-Enhanced Quantum Cryptography DTU Physics DTU Compute

Are you excited about information security and the novel possibilities opened up by quantum technology Are you fascinated by quantum physics and intriguing phenomena such as quantum entanglement nonlocality and indeterminism in quantum measurements And are you keen to work in a fast-moving interdisciplinary field combining physics math and computer science

At DTU Physics and DTU Compute we are seeking two outstanding postdoctoral candidates to work on theory of novel protocols stronger security proofs and efficient numerical techniques for semi-device-independent quantum cryptography. You will work within a synergetic cross-departemental project in which we aim to leverage symmetries and representation theory to tackle scenarios with large systems and many parties that are intractable with existing methods.

The project is hosted within the Section for Quantum Physics and Information Technology (QPIT) at DTU Physics and the Cybersecurity Engineering Section at DTU Compute. The work will be carried out in close collaboration with colleagues in both host groups and benefit from the extensive combined expertise in fundamental and applied quantum physics mathematics and cryptography within the two sections.

Successful candidates will be part of the teams lead by Prof. Jonatan Bohr Brask (DTU Physics) and Prof. Christian Majenz (DTU Compute).

QPIT is home to bigQ - Center for Macroscopic Quantum States - a Danish national Center of Excellence in quantum information science and technology. The purpose of the center is to explore quantum physics in new macroscopic regimes deepening our understanding of quantum physics and speeding up the development of emerging quantum technologies. Our main focus is basic research but we strongly encourage and support innovation and industry partnerships. The center offers a stimulating and diverse working environment comprising around 50 people (with 15 nationalities) including Faculty members PhD students postdocs engineers and an administrator.

The Cybersecurity Engineering section at DTU Compute offers a vibrant and collaborative research environment in cybersecurity and cryptography the research is focused on quantum-secure cryptography foundational cryptographic theory cryptographic protocols and symmetric-key cryptanalysis. The group maintains strong collaborations with leading institutions worldwide creating an inspiring setting for high-impact research.

Responsibilities and qualifications
We are looking for exceptional highly driven particular we are looking for academic excellence and/or demonstrated scientific achievements. We also expect you to have a strong ability to conceive new ideas and take initiative. Your internal drive to achieve significant and ground-breaking results is essential.

We expect you to:

• be motivated and dedicated to do research of the highest standards.
• enjoy working in a team be excited about sharing your expertise with other group members and at the same time have an open-minded spirit.
• share our values of scientific curiosity and creativity.
• be excited about large challenges and enjoy solving them.
• love scientific discussions!

You should hold a PhD in physics computer science mathematics or a related field and have demonstrated strong theoretical skills relevant to the topic of the project.

Expertise in any of the following areas is an advantage:

• Quantum cryptography (QKD QRNG or other protocols)
• Representation theory
• Bell nonlocality and device independence
• Randomness extraction methods
• Semidefinite programming / convex optimisation for quantum information science
• Implementations of the Navascues-Pironio-Acín hierarchy

In addition you should have excellent communication skills in English and be able to work both independently and as part of a team.

You will be expected to present your results in scientific publications and at international conferences and meetings.

You will also be participating in the supervision of bachelor- master- and possibly graduate-level students and in the lively academic environment within the sections with discussions seminars and social events.

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 aboutcareer paths at DTU here.

Further information
Associate Professor Jonatan Bohr Brask () or Associate Professor Christian Majenz ().

You can read more about DTU Physics at about DTU Compute at If you are applying from abroad you may find useful information on working in Denmark and at DTU atDTU Moving to Denmark.

Application procedure
Your complete online application must be submitted no later than 4 January 2026 (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 UNs 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 13500 students and 6000 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.