Postdocs in Squeezed Light Generation on a Photonic Integrated Platform

DTU Fysik
tirsdag 09 okt 18

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Frist 6. november 2018
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We are offering research positions for the development of on-chip squeezed light sources and for the development of photonic integrated applications in continuous variable quantum information science.

Since squeezed light was observed for the first time more than 30 years ago (1), the technology has undergone numerous developments and we are now at a point where efficient photonic integration seems viable. In this project we will explore the generation of squeezed and continuous variable entangled light in a photonic integrated circuit , aiming at scalability, cost effectiveness and low power consumption, while still maintaining quantum properties with highest quality. The ultimate aim is to develop a scalable platform which eventually allows for the integration of squeezed light into commercial applications such as quantum sensors and quantum communication devices. Within the project, we will also explore different continuous variable quantum information applications using the photonic integrated squeezed light circuits.

The project will be hosted by the Center for Macroscopic Quantum States bigQ at the Department of Physics, Technical University of Denmark (DTU) headed by Prof. Ulrik L. Andersen. It is part of a big European wide project and involves interaction with several European academic and industrial partners. The integrated circuits will be designed and fabricated by our European collaborators while the actual characterization and quantum optical experiments will be performed at DTU.

BigQ 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 testing a squeezed and entangled light source on an integrated platform as well as demonstrating different applications. Some of the tasks involved are 

  • design and development of a second harmonic generator and a parametric down-conversion squeezed light source on an integrated platform
  • strong interaction with the research group manufacturing the chips
  • testing chips and iterating designs
  • studying and demonstrating applications of integrated squeezed and entangled light
  • 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 prefered requirements: 

  • Background in optical parametric processes
  • Experience with optical design and electronics
  • Experience with integrated platforms
  • Knowledge of Python is an advantage

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.

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

You can read more about career paths at DTU here

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

Application procedure
Please submit your online application no later than 6 November 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 out 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 6,000 advance science and technology to create innovative solutions that meet the demands of society, and our 11,200 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.