Semiconductor quantum emitters under light-matter coupling conditions
The field of quantum technology has been rapidly expanding in the past decades, yielding numerous applications for quantum computation and simulation, quantum communication and key distribution, quantum metrology, sensing, and imaging. One of the central building blocks for photon-based quantum technologies is a quantum emitter (QE), a controllable source of photons. Semiconductor quantum dots (QDs) is one of the most prospective types of solid-state QEs due to the high photon emission efficiency and the possibility of the flexible control of their spectral properties by changing their size and structure. In our recent studies, QDs already have proven themselves as a promising nano-antennas (transferring the absorbed photons to other materials), and as a stable photoluminescence source  with unique nonlinear absorption properties allowing the up-converted photoluminescence , for the light-harvesting applications  and bio-labeling . Moreover, QDs have established themselves as a promising material for the design of single-photon QEs for quantum information applications , but still can’t be used as a source of photon-pairs emission on-demand due to the low photoluminescence quantum yield of biexciton state emitting photon pairs. Overcoming this limitation can be implemented through the light-matter coupling of QDs with optical micro- or plasmonic nano-cavities. In contrast to optical cavities, plasmonic nanocavities allow much better localization of electromagnetic modes on the nanometer scale, and the highest radiative rate acceleration factors that allow highly efficient photoluminescence and on-demand emission of photon pairs from a single QD by coupling of excitons with plasmons and forming plexcitons [6,7]. Moreover, the plasmon-exciton coupling enhances the nonlinear optical properties of QDs making them even more efficient up-conversion sources [8,9]. The next step in the design and operation of plexciton-based QEs is a control of the optical properties on the level of the single QE without changing the structure and/or morphology of QD. By tuning the light-matter coupling efficiency, the properties of QDs may be reversibly modulated thus switching the operation mode between single-photon emission mode and two-photon emission mode. Moreover, for future research, I propose the use of the plasmon-optical hierarchical cavities, which may allow reaching not only a weak also, with a high likelihood, strong and even ultrastrong coupling regime, thus mixing the properties of light and matter and allowing more QE properties to be tuned in more substantial ways without changing the QD original structure. The proposed research gives the prospect of unveiling new possibilities of controlling the quantum properties of photons emitted by solid-state QEs and opening up new areas of fundamental and practical research.
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Host: Daniel Sanchez Portal
Auditorium, Centro de Fisica de Materiales
Victor Krivenkov, CFM