Postdoc in Biophysics Applications of Squeezed Light

DTU Fysik
torsdag 07 dec 17

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Frist 5. januar 2018
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Are you an expert in cavity-based optical parametric oscillators or amplifiers, and you are interested in going one step further by exploring the potential of squeezed light in quantum-enhanced bio-imaging? We are offering a research position for the development of squeezed light applications with focus on imaging technology for biophysics and biomedicine.

Since squeezed light was observed for the first time for more than 30 years ago (1), the technology has matured to the point where it seems possible to integrate a squeezed light source in practical imaging technologies. In this project we are going to explore such applications, aiming at performing proof-of-principle experiments on biological samples using squeezed light to beat the shot noise limit and thereby achieving unprecedented imaging accuracy. The ultimate aim is to discover new bio-physical effects not visible by standard classical approaches. The project will cover the full value chain from basic research to innovation.  

The project will be hosted by the section for Quantum Physics and Information Technology (QPIT) at the Department of Physics, Technical University of Denmark (DTU) headed by Prof. Ulrik L. Andersen. It is part of the Quantum Innovation Center – Qubiz - (, which is a joint Danish national center including DTU, Copenhagen University and Aarhus University with the mission to harness the very strong Danish research positions within quantum technology for creating new quantum technology businesses.

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 have extensive experience in squeezed light generation for quantum computing (2), quantum communication (3), quantum sensing (4) and mechanical cooling (5).

(1) Andersen et al., “30 years of squeezed light generation”, Physica Scripta 91, 053001 (2016)
(2) Marshall et al., “Continuous-variable quantum computing on encrypted data”, Nature Communications 7, 13764 (2016)
(3) Madsen et al, “Continuous variable quantum key distribution with modulated entangled states”, Nature Communications 3, 1083 (2012)
(4) Berni et al., “Ab initio quantum-enhanced optical phase estimation using real-time feedback control”, Nature Photonics 8, 577 (2015)
(5) Schäfermeier et al., “Quantum enhanced feedback cooling of a mechanical oscillator using nonclassical light”, Nature Communications 7, 13628 (2016)   

Responsibilities and tasks
We are looking for a highly motivated candidate who will be in charge of developing, optimizing, and implementing applications of squeezed light. Some of the tasks involved are 

  • improvement and robust operation of a parametric down-conversion squeezed light source.
  • design and development of an ultra-low loss phase-contrast microscope with squeezed light
  • development of efficient data acquisition algorithms and data analysis
  • studies of fundamental bio-physical mechanism
  • supervision of students
  • innovation activities  

The postdoc candidate should have a PhD or equivalent degree in physics or engineering. He or she should be highly motivated and dedicated to carry out research and innovation at the highest standards. Other requirements: 

  • Strong background in optical parametric processes
  • Experience with optical (cavity) design and electronics
  • Knowledge of Python is an advantage (but not a requirement)

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 an academic freedom tempered by responsibility.

Salary and terms of employment
The appointment will be based on the collective agreement with the Confederation of Professional Associations. The allowance will be agreed with the relevant union. The period of employment is 2 years.

The work will take place at the DTU campus in Lyngby. 

Further information
Informal inquiries can be made to Assist. Prof. Tobias Gehring, or Prof. Ulrik L. Andersen,  

Application procedure
Please submit your online application no later than 5 January 2018 (Local 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 in the online application form, and attach all your materials in English in one PDF file. The file must include: 

  • Application (cover letter)
  • CV
  • Diploma (MSc/PhD)
  • List of publications
Applications and enclosures 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.

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. We are situated just north of Copenhagen at the Lyngby campus of DTU, one of the leading technical universities of Northern Europe, where we enjoy newly renovated office and lab space.

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 5,800 advance science and technology to create innovative solutions that meet the demands of society; and our 11,000 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government, and public agencies.