Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.146
Publication date: 18th December 2023
The production of single indistinguishable photons is important for linear optical operations, in the realization of photonic-based quantum computational circuits. The present work aims to investigate the use of the exciton recombination in single CsPbBr3 and CsPb(Br/CL)3 perovskite nanocrystals as a source of single indistinguishable photon emission. Using the HONG-OU-MANDEL(HOM) interference technique, two sequentially produced photons are overlapped to investigate the interfering visibility [1,2]. The nanocrystals are synthesized by the group of M. Kovalenko (ETH Zürich & EMPA Dübendorf) to have a rod-like symmetry. By breaking the symmetry of the confinement potential, the exciton emission spectra reduce to a pure singlet line. This eases the collection of the emitted photons, as filtering of orthogonal polarization states is not needed and a Bandpass filter can be employed (mainly to suppress biexciton light). The nanocrystals show ~50 ps lifetime [Fig.] and a narrow spectral line at cryogenic temperatures. I will present our HOM results and compare them with previous work[3]. We achieve low g2(0) values around 0.10 [Fig.] and uncorrected HOM interference visibility up to 0.44.
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