Promotionsprogramm hsnForschungsprojekte
Spin-photon interface in quantum dots

Spin-photon interface in quantum dots

Leitung:  Supervisor: Prof. Fei Ding, LUH, Institute for Solid State Physics, Co-Supervisor: Prof. Dr. Michael Oestreich,LUH, Institute for Solid State Physics
Jahr:  2020
Bemerkungen:  Projekt-ID: 81

Yes! Quantum computers are attractive. But, the real question is how to build them. To date, there are several different approaches to quantum computing. Most of them (if not all) require the electrical and/or optical manipulations of the so-called quantum bits (qubits) in a coherent way. The phase coherence of isolated spins in semiconductors can persist for long times, reaching tens of milliseconds for electron spin and tens of minutes for nuclear spin. This offers an exciting opportunity to implement a semiconductor quantum computer, which can be built by using the mature industrial technologies.

Among the different semiconductor platforms, the self-assembled quantum dots (QDs) attracted great interest in the community. The spins strongly confined in QDs are natural choices for qubits in quantum computations. Two groups in Leibniz University Hannover, which are led by Prof. Fei Ding and Prof. Michael Oestreich, respectively, have extensive experiences on the growth, characterization (optical properties, spin noise spectroscopy) and device fabrication of semiconductor QDs. In the framework of Hannover School for Nanotechnology, the two groups will team up to investigate the spin properties in several newly developed semiconductor QD systems.

In this PhD project, we will investigate the spin-photon interface, which is an important step towards the long-distance spin-spin coupling/entanglement and therefore distributed quantum computing. Semiconductor QDs exhibit near-unity radiative efficiency and allow ultrafast optical coherent spin manipulations. Our group has done a number of high quality works on QD-based quantum light sources. Now, it is an important goal to realize the spin-photon interface using a deterministically charged QD strongly coupled to an optical microcavity. It will be a crucial milestone to the realization of spin-spin entanglement between two remote QDs in a distributed quantum (computer) networks.