PhD Position: Ultra-Low Noise Laser Sources for Quantum Communication – DTU Electro

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PhD Position: Ultra-Low Noise Laser Sources for Quantum Communication – DTU Electro
Kgs. Lyngby, Denmark

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Job Description

DTU Electro invites applications for a position as a PhD student in ultra-low noise laser sources for quantum communication within the the Marie Skłodowska-Curie QuNEST– Quantum Enhanced Optical Communication Network Security doctoral training program. The position is focused on a developing single and –multi frequency laser sources with the minimum amount of noise (quantum limit), as well as investigating the impact of noise for continuous variable quantum communication systems. The start date is flexible.
We seek a motivated, curious, and outgoing PhD candidate with a solid background in laser physics, fiber-sensing or fiber-optic/quantum communication. Experience with machine learning, digital signal processing and experimental work is a plus.
The project goal is to explore reinforcement learning to realize feedback control that can enable quantum noise limited operation of single and multi-frequency laser sources. The project will cover both algorithm development as well as experimental implementations. Throughout the project, a close collaboration with NKT Photonics is envisioned.
We offer an opportunity to develop expertise in various domains, including but not limited to:

• Realization of experimental procedures for noise characterization 
• Machine learning techniques for noise characterization 
• Reinforcement learning for feedback control 
• Building quantum communication systems 
• Investigating the impact of noise secret key rate and transmission distance 

As a PhD candidate at DTU, you will take part in an educational program of 30 ECTS tailored to your needs on technical subjects, as well as on the “soft skills” needed for a successful career either in industry or academia. 
Your tasks will include research into novel methods for noise characterization and stabilization of lasers and frequency combs. The overall goal will be to devise strategies for quantum noise limited performance. Specifically you will focus on the following areas: 

• Subspace tracking and autoencoders for amplitude and phase noise characterization 
• Building experimental set-ups for noise characterization
• Reinforcement learning strategies for designing feedback loops 
• Relating the amplitude-phase noise correlation matrices to frequency comb’s physical parameters 
• Maintenance  of the GitHub repository for the developed code 
• Organizing and managing joint experiments with the collaboration groups

Eligible candidates must not have resided or carried out their main activity (work, studies, etc.) in the country of the recruiting beneficiary for more than 12 months in the 36 months immediately before their date of recruitment. 
You 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 and some international experience. 
The QuNEST doctoral network project is highly multi-disciplinary, spanning areas of quantum physics, photonics, optical transmission, Quantum Key Distribution (QKD) protocols, implementation security, error correction algorithms, digital signal processing, networks and control. The network focuses on cross-disciplinary and intersectoral training, targeted at creating experts in this emerging multidisciplinary field. The Doctoral Candidates will be able to convert knowledge and ideas into new products, and services for economic and social benefit.  
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.
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 DTU's rules for the PhD education . 
Salary and appointment terms 
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations and the living, mobility and family allowances, specified in the Horizon Europe Marie Curie project, will be incorporated into the total salary. All allowances included in the salary package, are considered as salary by Danish tax authorities, and will be taxed as income. The final salary will be calculated and 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 Professor Darko Zibar, [email protected] .
The following papers are a good indication of the nature of the project and are good starting point to get familiar with the topic: 

Darko Zibar, Jens E. Pedersen, Poul Varming, Giovanni Brajato, and Francesco Da Ros, "Approaching optimum phase measurement in the presence of amplifier noise," Optica 8, 1262-1267 (2021)

Aleksandr Razumov, Holger R. Heebøll, Mario Dummont, Osama Terra, Bozhang Dong, Jasper Riebesehl, Poul Varming, Jens E. Pedersen, Francesco Da Ros, John E. Bowers, and Darko Zibar, "Subspace tracking for phase noise source separation in frequency combs," Opt. Express 31, 34325-34347 (2023)

You can read more about DTU Electro at https://electro.dtu.dk/.
If you are applying from abroad, you may find useful information on working in Denmark and at DTU at DTU – Moving to Denmark . Furthermore, you have the option of joining our monthly free seminar “PhD relocation to Denmark and startup “Zoom” seminar ” for all questions regarding the practical matters of moving to Denmark and working as a PhD at DTU. 
Application procedure 
Your complete online application must be submitted no later 27 March 2024 (23:59 Danish time). Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link "Apply now", 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 (in English) including official description of grading scale

You may apply prior to ob­tai­ning your master's degree but cannot begin before having received it. 
Applications received after the deadline will not be considered.
All interested candidates irrespective of age, gender, race, disability, religion or ethnic background are encouraged to apply.
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 mission to develop and create value using science and engineering to benefit society. That mission lives on today. DTU has 13,500 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. DTU has campuses in all parts of Denmark and in Greenland, and we collaborate with the best universities around the world.

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Job Info

• Job Identification 2624
• Job Category Phd
• Posting Date 03/13/2024, 09:33 AM
• Apply Before 03/27/2024, 06:59 PM
• Locations Ørsteds Plads, Kgs. Lyngby, 2800, DK

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  Ørsteds Plads, Kgs. Lyngby, 2800, DK

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