Long-distance Continuous Variable Quantum Key Distribution with Amplifiers and Memories Manchester Metropolitan University in United Kingdom

This PhD project at Manchester Metropolitan University focuses on advancing quantum key distribution (QKD) for long-distance secure communication. Entanglement distribution is a foundational capability for quantum networks, enabling diverse quantum technologies including QKD, which provides information-theoretic security even against quantum-capable adversaries. QKD is one of the most mature and commercially relevant applications of quantum communication, but current QKD links are limited to short distances. Overcoming this limitation requires quantum repeaters, which enable long-distance entanglement distribution and are essential for building large-scale, secure quantum networks.

The project aims to develop efficient, scalable, and physically realizable repeater-assisted architectures for entanglement distribution protocols. You will investigate optical quantum repeaters for long-distance secure QKD, developing theoretical frameworks to analyze repeater architectures and evaluating both amplifier-enhanced and memory-assisted protocols. A key aspect of the research is to create experiment-ready models that rigorously account for realistic device imperfections, bridging the gap between theory and practical implementation.

Specific objectives include: developing a generalized theoretical framework for quantum repeater architectures; investigating and comparing specific QKD protocols; modeling realistic device imperfections by incorporating loss, noise, and other experimental constraints into the theoretical analysis; providing design guidelines for future experimental implementations of quantum repeater networks, specifying hardware requirements and performance benchmarks; and contributing to the development of large-scale quantum communication infrastructure by identifying viable pathways for practical deployment of secure quantum networks.

Funding is available for both Home and International students. Home tuition fees (£5,006 for 2025/26) are covered for the duration of the 3-year award. Eligible international students will need to make up the difference in tuition fee funding (Band 2 for 2025/26). The student will receive a standard UKRI stipend payment (£20,780 for 2025/26) for the duration of the award.

Applicants should have a first or upper second class (2:1) honours degree from a UK university or an equivalent qualification (or be close to completing) in Physics, Electrical Engineering, Computer Science, or a related discipline. Strong analytical and problem-solving skills, motivation for independent research, and the ability to work independently and collaboratively are essential. Knowledge of optics, communications, quantum optics, and quantum communications is desirable. Familiarity with programming (MATLAB, Python, etc.) is also desirable.

To apply, interested applicants should contact Dr Masoud Ghalaii ([email protected]) for an informal discussion. Complete the online application form for a full-time PhD in Computing & Digital Technology, fill out the Doctoral Project Applicant Form, and upload your CV and covering letter in the supporting documents section of the University’s Admissions Portal. Applications close on 9 March 2026, with an expected start date in October 2026. Please quote the reference SciEng-MG-2025-26-Quantum Key Distribution.