We have both experimental and theoretical master's projects. Our research areas among other things include quantum information, quantum computing, quantum optics, experiments using slow light (a few km/s), ultra-stable lasers and medical imaging. If you are interested in carrying out an master's project in the group please contact Stefan Kröll (see below on page) or the relevant contact person listed below.

Theoretical projects would typically involve computer simulation of light matter interaction schemes or light propagation in tissue.

Experimental projects would typically involve construction and then testing of equipment or devices for new experiments in actual measurement situations. The experimental projects can often have a distinct engineering character.

In addition to the specific projects listed below, we may also have new project ideas, so please contact us if you think our work in general sounds interesting, but are wondering if there are other projects.

Currently available master's (and bachelor's) projects and who to contact

Developing techniques for optical imaging deep inside the body

Optical imaging inside the body is limited by random light scattering in tissue to a depth of few centimeters. which means that many vital organs, heart, brain, etcetera,  cannot easily be studied using optical methods. This project aims at carrying out experiments which enables light to take a short path through the body using optical beam shaping and phase conjugation techniques. The experimental data will be compared with theoretical modelling carried out at the division electromagnetic field theory.

Project description (pdf, 311kB)

Project contact: Stefan Kröll stefan.kroll@fysik.lth.se

Quantum optics micro-cavity improvements

In order to build a quantum computer we in Lund are using rare-earth ions that are doped into crystals. These ions have excellent lifetimes and coherences times, making them good qubits. At the same time, the long lifetimes makes them difficult to detect. Therefore, there is an ongoing effort to use an optical micro-cavity to enhance the fluorescence from them by using quantum optic effects to reduce their spontaneous lifetime. At this point, our cavities could be substantially improved if they were more stable against mechanical vibrations.

Project 1: active stabilization system

One way to improve the stability is to implement an active stabilization of cavity, thus removing any vibrations that could otherwise disturb your system. This can be done by having another laser measure the cavity length accurately by interferometry, and then correct for any vibrations with a piezo-electric crystal. In this project you will combine lasers, optics and feedback/control design to make a stabilization setup that will help us improve our quantum computer readout.

Project 2: mechanical modelling

Another way to improve the cavity stability is to design a more rigid cavity assembly in the first place. This is challenging since the whole assembly should be cooled down to about 1 K, and this should not induce too much strain, while still allowing the actual mirrors in the cavity to be moveable. Therefore, we would like to create an accurate mechanical model of the cavity assembly and try to simulate its behavior to find an optimally stable design.

Project contact: Andreas Walther andreas.walther@fysik.lth.se

Projects in Laser stabilization and fast light may also be available

Project contact: Lars Rippe lars.rippe@fysik.lth.se

Page updated (2019-12-18)