Postdoc position on High-Efficiency Single Photon Sources on Lithium Niobate Photonics Platform

Thursday 05 Sep 19

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Integrated photonics has played a more and more important roles for quantum photonics technologies, such as quantum communication, quantum computing, quantum simulation and so on. Though significant progress has been achieved over the past years, high-efficiency and indistinguishable single photon source is still mystery and present one of the major bottlenecks.

This postdoc project, which is tied to the VILLUM FOUNDEN Young Investigator project on Silicon-Lithium Niobate Hybrid Integrated Quantum Photonics (QUANPIC), will investigate bright and indistinguishable single photon sources on the lithium niobate on insulator (LNOI) platform. Waveguides on periodical poling lithium niobate (PPLN) will be designed for efficient parametric down conversion for single photon generation. Ultra-low loss PPLN waveguide will be fabricated in our state-of-the-art cleanroom DTU Nanolabs (former DTU Danchip). Multiplexing technology be investigated aiming to achieve near-deterministic single photon sources.

The Postdoc project will be
will partly be tied to the High Speed Optical Communications group (HSOC) and partly to the Nanophotonic Devices group at the Department of Photonics Engineering at the Technical University of Denmark (DTU Fotonik). The HSOC group is at the very forefront of international research in high-dimentional quantum communications technology and holds a number of world records within silicon photonics and ultra-high speed optical communication. The Nanophotonics Devices group work within a broad range of topics ranging from advanced passive devices for frequency- and spatial-domain light manipulation to complex integrated optoelectronic components with tailored material responses that allows light emission and control in the temporal domain. Both groups are at a highly international level, encourages collaborative work, and offers an informal working environment. The project will have access to on-site and state-of-the-art experimental and cleanroom facilities.

Responsibilities and tasks
This Postdoc position will be part of the VILLUM QUANPIC project and will target experimental and theoretical investigation of the topics below: 

  • Design of PPLN waveguide for efficient parametric down conversion.
  • Fabrication of ultra-low loss PPLN waveguide based single photon sources, aiming high brightness and excellent indistinguishability. Quantum optical correlation measurements and statistical data analysis.
  • Design of ultra-low loss fiber-to-chip couplers on the LNOI platform.
  • Characterization of the single photon source with our state-of-the-art superconductive nanowire single photon detectors.
  • Investigation of multiplexing technology to achieve near-deterministic single photon source.
  • Investigation of multiphoton quantum states based on the achieved single photon sources

The exact research activities will be continuously adapted to ensure high relevance and impact.

Candidates should have a PhD degree or equivalent. 

The successful candidate is expected to have experience and expertise in one or more of the following subjects:

  • Experienced in single photon sources.
  • Background in quantum optics and nanofabrication technology.
  • Experienced in integrated photonics.
  • Self-motivation in scientific research.
  • Good communication skills in English, both written and spoken.

The assessment of the applicants will be made by Senior Researcher Yunhong Ding and Dr. Davide Bacco. 

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 Confederation of Professional Associations. The allowance will be agreed with the relevant union. The period of employment is 24 months.

The place of work is DTU Fotonik, Lyngby Campus, Denmark.

You can read more about
career paths at DTU here.  

Further information
Further information may be obtained from Senior Researcher Yunhong Ding, e-mail: and Dr. Davide Bacco, e-mail:

You can read more about DTU Fotonik on  

Please submit your online application no later than 1 November 2019 (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.

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

DTU Fotonik has 210 employees with competences in optics and is one of the largest centers in the world based solely on research in photonics. Research is performed within quantum photonics, optical sensors, lasers, LEDs, photovoltaics, ultra-high speed optical transmission systems, bio-photonics, and nano-optics.

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 university collaborating globally with business, industry, government and public agencies.