Semiconductor-based single-photon sources for quantum-information processing.
Abstract: Non-classical light sources are the most fundamental building blocks for quantum communication systems. In recent years significant progress has been achieved in this field, however, most of the realized devices are based on spatially and spectrally random distribution of quantum emitters and as a result very low yield of the fabrication process. Self-assembled semiconductor quantum dots (QDs) integrated deterministically into monolithic microlenses are very promising candidates to realize such a non-classical light source. In this work we report on a concept based on the ex-situ external strain tuning of deterministically fabricated single QD-microlens structures realized by applying voltage to a ferroelectric material bonded to the structure. Using this concept the optical properties of QD, i.e. the emission and binding energies of excitonic complexes confined in the QD as well as, exciton fine structure splitting, can be tuned to realize a source of entangled photon pairs on demand.
Reminder: Tea and cookies will be in the seminar room before the seminar.