Postdoc in Continuous-Variable Quantum Key Distribution for Telecom Networks

Wednesday 23 Dec 20

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Continuous-variable quantum key distribution (CV-QKD) is a well established technology to distribute secret keys between two parties for data encryption. The technology has strong similarities to coherent optical telecommunication, however noise is crucial as it is attributed to an eavesdropper and, thus, drastically reduces performance. Within this position you will experimentally investigate the integration of CV-QKD into telecom networks. You will use coherent and in particular squeezed states for the demonstrations and work together with partners from the EU Quantum Technology Flagship projects Uniqorn and CiViQ as well as OpenQKD.

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).

QPIT conducts widely recognized research within a range of diverse topics such as continuous-variable quantum information processing, quantum enhanced sensing, and engineering of solid state quantum systems. We are part of the EU Flagship project Continuous Variable Quantum Communication (CiViQ), the Photonic Integration project UNIQORN and the EU H2020 Quantum Key Distribution Testbed project OPENQKD.

Responsibilities and qualifications
We are looking for a highly motivated candidate who will be in charge of experimental demonstrations of continuous-variable quantum key distribution. You will

  • experimentally demonstrate wavelength division multiplexing of CV-QKD using squeezed light and telecommunication
  • experimentally demonstrate long distance CV-QKD with squeezed light in the lab
  • implement an in-field demonstration between DTU and downtown Copenhagen
  • demonstrate CV-QKD with squeezed light from a chip integrated source across DTU’s campus together with experts on chip integrated squeezed light
  • help supervising a PhD student

As a formal qualification, you must have a PhD degree or equivalent.

You have a passion for photonics and you are familiar with I/Q (amplitude / phase) modulation, be it from a background in telecommunications or quantum optics with continuous variables and you are intrigued by its application in quantum key distribution. You enjoy finding clever solutions to difficult problems and further you have the following qualifications:

  • Experience with working with amplitude and phase modulation and (coherent) detection: telecommunication or quantum optics
  • Experience with fiber optics
  • Some experience with python or matlab programming

Experience with squeezed light is a plus but not required and can be obtained on the job.

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 Tobias Gehring, or Ulrik Andersen,

You can read more about DTU Physics at

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 31 January 2021 (Danish time)Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link "Apply online", 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)
  • List of publications

All interested candidates irrespective of age, gender, disability, race, religion or ethnic background are encouraged to apply.

QPIT's vision is to understand, engineer and control complex quantum systems of light and matter, and to exploit these systems for quantum information processing and quantum metrology. We are a large, highly international research group of students and staff with diverse backgrounds. We have a friendly and dynamic research environment with close, daily interaction among all group members and strong collaborations with many academic and industrial partners. Technical support is excellent with electronics and process engineers embedded in the section and a large capacity, skilled mechanical workshop at the Department.

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 vision to develop and create value using science and engineering to benefit society. That vision lives on today. DTU has 12,000 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. Our main campus is in Kgs. Lyngby north of Copenhagen and we have campuses in Roskilde and Ballerup and in Sisimiut in Greenland.