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End date: 2022 × Start date: 2021 × End date: 2024 × Start date: 2020 × DDC: 600 × Publisher: Basel : MDPI × WGL Institute: IPHT ×

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    Universal Tool for Single-Photon Circuits: Quantum Router Design
    (Basel : MDPI, 2020) Sultanov, Aydar; Greenberg, Yakov; Mutsenik, Evgeniya; Pitsun, Dmitry; Il’ichev, Evgeni
    We demonstrate that the non-Hermitian Hamiltonian approach can be used as a universal tool to design and describe a performance of single photon quantum electrodynamical circuits (cQED). As an example of the validity of this method, we calculate a novel six port quantum router, constructed from four qubits and three open waveguides. We have obtained analytical expressions, which describe the transmission and reflection coefficients of a single photon in general form taking into account the spread qubit’s parameters. We show that, due to naturally derived interferences, in situ tuning the probability of photon detection in desired ports
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    2-LED-μspectrophotometer for rapid on-site detection of pathogens using noble-metal nanoparticle-based colorimetric assays
    (Basel : MDPI, 2020) Reuter, Cornelia; Urban, Matthias; Arnold, Manuel; Stranik, Ondrej; Csáki, Andrea; Fritzsche, Wolfgang
    Novel point-of-care compatible methods such as colorimetric assays have become increasingly important in the field of early pathogen detection. A simple and hand-held prototype device for carrying out DNA-amplification assay based on plasmonic nanoparticles in the colorimetric detection is presented. The low-cost device with two channels (sample and reference) consists of two spectrally different light emitting diodes (LEDs) for detection of the plasmon shift. The color change of the gold-nanoparticle-DNA conjugates caused by a salt-induced aggregation test is examined in particular. A specific and sensitive detection of the waterborne human pathogen Legionella pneumophila is demonstrated. This colorimetric assay, with a simple assay design and simple readout device requirements, can be monitored in real-time on-site. © 2020 by the authors.