PhD scholarship in Long Distance Quantum Communication

Danmarks Tekniske Universitet (DTU)

Ph.d. & forskning

Frist 16. juni 2017

DTU Fotonik works with all areas of photonic engineering, including a strong focus on optical communications. We are now seeking a PhD student to do research within Quantum communication. The Research will be carried out within the centre of excellence Silicon Photonics for Optical Communications (SPOC) funded by the Danish National Research Foundation. Starting date in the fall 2017.

Responsibilities and tasks
Application of so-called higher order mode fiber optics is promising as a means to enhance the capacity of ultimate secure communication systems, more specifically to distribute secure keys in such systems, also referred to as quantum Key Distribution (QKD). The reason for this is that higher order modes enable exploitation of the transverse distribution of light in the fiber to support orthogonal quantum states of light. Currently, such orthogonal states of light are achieved by using the polarization degree of freedom, for example in the established BB84 protocol. However, recent developments of fiber optics, e.g. processing of fibers that support propagation of modes with orbital angular momentum (OAM), have seeded increased interest in using the spatial distribution of light to increase the capacity of QKD systems. Specific advantage of OAM states include that such modes ideally are more robust during propagation since intermodal coupling is prohibited, that entangled quantum states may potentially be created among such modes and that the use of high-dimensionality in quantum communications (QC) enable a longer link distance and higher secret key rate, thanks to a larger threshold on the bit error rate compared to the two-dimensional case. Finally, high-dimensional entangled quantum states are useful for quantum teleportation and quantum-repeaters and thus the exploitation of orbital angular modes hold promise for application in future high-dimensional QC systems.

In this PhD project we wish to explore application of high-dimensional QC together with entanglement, more specifically, we would like to explore the potential of having entanglement between states that may be transmitted in higher order modes or in multi core fibers. This requires that one is capable of generating high-dimensional entangled states and that such can be successfully transmitted and detected. Part of the project will include this together with other expected challenges foreseen to achieve this goal, including understanding of the impact of nonlinear coupling among modes, multiplexing and de-multiplexing of modes, measurement device independent QC schemes and evaluation and suggestion of novel fibers for optimized high dimensional QC systems.

The project will be hosted by the SPOC center of excellence. Within this center we have activities on exploring OAM states for classical high capacity systems, activities on QKD, where we until this point in time have developed new protocols. Finally we also have activities related to excitation and characterization of higher order modes in optical fibers. The proposed project will benefit and collaborate with these activities.

Candidates should have a master's degree in engineering/Physics or a similar degree with an academic level equivalent to the master's degree in engineering/Physics.

Approval and Enrolment
The scholarships for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide.

The assessment of the applicants will be made by Professor Karsten Rottwitt, Professor Leif Oxenløwe and Researcher Yunhong Ding.

We offer
We offer an interesting and challenging job in an international environment focusing on education, research, scientific advice and innovation, which contribute to enhancing the economy and improving social welfare. We strive for academic excellence, collegial respect and freedom tempered by responsibility. The Technical University of Denmark (DTU) is a leading technical university in northern Europe and benchmarks with the best universities in the world.

Salary and appointment terms
The salary and appointment terms are consistent with the current rules for PhD degree students. The period of employment is 3 years.

Further information
Further information may be obtained from Prof. Karsten Rottwitt, , Professor Leif Oxenløwe, and Researcher Yunhong Ding,

You can read more about DTU Fotonik on

Please submit your online application no later than 16 June 2017. 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:

  • 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.

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 optical sensors, lasers, LEDs, photovoltaics, ultra-high speed optical transmission systems, bio-photonics, nano-optics and quantum photonics.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 10,600 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.

Ansøgningsfrist d. 16.06.2017

Ph.d. & forskning
Maskin & Design
Matematik, Fysik & Nano
Teknik & Teknologi
Data & analyse
Forskning & Udvikling

Opslag oprettet d. 17.05.2017, sidst opdateret d. 17.05.2017

Danmarks Tekniske Universitet (DTU) - hurtig overblik

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Anker Engelunds Vej 1 101 A
2800 Kgs. Lyngby

Forskning & Uddannelse

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