Quantum frequency conversion for long-range networks

The goal of this PhD project is to develop nonlinear techniques that enable single photons to be coherently converted between different wavelength bands.

Working as part of the UK Quantum Technology Hub Networked Quantum Information Technologies (NQIT) and in collaboration with researchers from Oxford and Southampton, we have recently achieved the conversion of single-photon-level blue light to the near infrared (manuscript in preparation). Ultimately, this will enable long-range quantum communication networks to be implemented by shifting photons to wavelengths suitable for transmission in optical fibre while remaining entangled with trapped ions in remote locations.

Within in the Centre for Photonics and Photonic Materials (CPPM) at the University of Bath, you will build on our recent results to develop frequency-conversion techniques suitable for deployment in real-world quantum networks. To achieve this goal, the conversion efficiency of the process must be increased, and the characteristics of the photons must be made to match those in the ion-photon interface. You will need to acquire a deep understanding of quantum optics and frequency conversion both in nonlinear crystals and in special optical fibre, known as photonic crystal fibre, that we fabricate here in Bath. You will be involved in all aspects of the project, from theory and modelling of the frequency-conversion process, through experimental design, to implementation of your ideas in the laboratory, writing up results and presenting at high-profile conferences.

You will be integrated into the supportive environment of the CPPM and its tight-knit cohort of graduate students (currently numbering in excess of 20), benefitting from the experience of senior students and post-doctoral researchers working in related areas. You will have the opportunity to learn how to design and fabricate your own optical fibre using the cleanroom facilities in the CPPM. You will be expected to take part in weekly Centre meetings including giving research and journal club presentations as well as participating in “Quantum Club“, the CPPM’s journal discussion group focused on quantum optics.

An undergraduate degree in physics or a related subject at 2.1 level or above is essential. Some laboratory experience with lasers and optics is desirable but not essential.

Informal enquiries should be directed to Dr Peter Mosley ([Email Address Removed])

Formal applications should be made via the University of Bath’s online application form for a PhD in Physics:
https://www.bath.ac.uk/samis/urd/sits.urd/run/siw_ipp_lgn.login?process=siw_ipp_app&code1=RDUPH-FP01&code2=0012

More information about applying for a PhD at Bath may be found here:
http://www.bath.ac.uk/guides/how-to-apply-for-doctoral-study/