PhD scholarship in Continuous-Variable Quantum Key Distribution with Squeezed Light

onsdag 23 dec 20

Send ansøgning

Frist 31. januar 2021
Du kan søge om jobbet ved DTU Fysik ved at udfylde den efterfølgende ansøgningsformular.

Ansøg online

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 CV-QKD with squeezed light which offers performance benefits in comparison to the standard coherent states. Squeezed states are quantum states of light which exhibit lower noise than coherent states in one field quadrature.

You will distribute squeezed and entangled states between two locations within DTU’s campus and also down-town Copenhagen. Furthermore you will demonstrate CV-QKD between those locations. The PhD project includes an external stay at an international research institution, and you will work together with partners from the EU Quantum Technology Flagship projects Uniqorn and CiViQ as well as OpenQKD.

Responsibilities and qualifications
We are looking for a highly motivated candidate who will perform experimental demonstrations of continuous-variable quantum key distribution with squeezed light. You will:

  • Experimentally distribute squeezed and entangled states across DTU’s campus and from DTU to down-town Copenhagen
  • Experimentally demonstrate CV-QKD with squeezed states in the lab and in the field

You have a passion for photonics and you are familiar with I/Q (amplitude / phase) modulation, be it from a background in telecommunications, quantum optics with continuous variables, interferometry or similar 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 lasers, amplitude and phase modulation and (coherent) detection
  • Experience with fiber optics is a plus
  • Some experience with python or matlab programming

Experience with squeezed light is not required and can be obtained during the PhD project.

You should have a two-year master's degree (120 ECTS points) or a similar degree with an academic level equivalent to a two-year master's degree.

Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval, and the candidate will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the PhD study programme, please see the DTU PhD Guide

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 appointment terms
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 3 years.

You can read more about career paths at DTU here

Further information
Further information may be obtained from Assoc. Prof. Tobias Gehring, or Prof. 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:


  • A letter motivating the application (cover letter)
  • Curriculum vitae
  • Grade transcripts and BSc/MSc diploma
  • Excel sheet with translation of grades to the Danish grading system (see guidelines and Excel spreadsheet here)

Candidates may apply prior to ob­tai­ning their master's degree but cannot begin before having received it.

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

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'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