Implementation of linear-optical controlled-phase gate with programmable phase shift

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73635255" target="_blank" >RIV/61989592:15310/25:73635255 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Implementation of linear-optical controlled-phase gate with programmable phase shift
Original language description
This reasearch report summarizes the implementation of a tunable optical controlled-phase gate with a programmable phase was carried out. The reactivation and precise alignment of a three-photon source were performed. The source was based on the generation of two photons via spontaneous parametric down-conversion in a BBO crystal and a third photon obtained by attenuating the fundamental component of the pump laser. The setup was configured as a primary source of correlated photon pairs with tunable separability in time and polarization. The optimization of the source was achieved by observing the Hong–Ou–Mandel effect. The photons were directed onto a beam splitter and detected in separate detectors in coincidence measurements. Depending on the relative temporal delay between the photons, an interference dip with visibility of up to 96% was observed, confirming high-quality spatial, temporal, and polarization overlap. The source was subsequently employed in an experimental branch for measurements of three-photon interference with a pump beam of tunable polarization.
Czech name
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Czech description
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Publication year
2025
Confidentiality
U - Předmět řešení projektu je utajovanou skutečností podle zvláštních právních předpisů nebo je skutečností, jejíž zveřejnění by mohlo ohrozit činnost zpravodajské služby. Údaje o projektu jsou upraveny tak, aby byly zveřejnitelné

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