Essays about: "kvantkommunikation"

Found 5 essays containing the word kvantkommunikation.

  1. 1. Communication and Error Correction via Polarisation of Single Photons and Time Ordering

    University essay from KTH/Tillämpad fysik

    Author : Shek Lun Leung; [2023]
    Keywords : Quantum Technology; Physics; Photon; Telecommunication; polarization; time ordering; BPPM; PPM; OOK; Simulation; quantum communication; Kvantteknologi; Fysik; Foton; Telekommunikation; polarisering; tidsordning; BPPM; PPM; OOK; Simulering; kvantkommunikation; satellite communication;

    Abstract : This research study aims to investigate the capacity of single photons to carry information through polarization and time ordering and proposes a protocol called Beyond Pulse Position Modulation (BPPM) to improve photon-based communication reliability over longer distances with limited power. Such a protocol may be used in any communication scenario where energy efficiency is important, e. READ MORE

  3. 2. Construction of a scanning confocal microscope for Quantum Dot mapping at telecom wavelength

    University essay from KTH/Tillämpad fysik

    Author : Alexandros Bampis; [2023]
    Keywords : Nanophotonics; Quantum Dot Positioning; Photoluminescence Mapping; Scanning Microscope; Nanofotonik; Positionering av kvantprickar; Fotoluminescenskartläggning; Skanningsmikroskop;

    Abstract : Future commercial applications making use of non-classical light sources require bright quantum emitters. Such emitters can be achieved by embedding self-assembled, optically active semiconductor quantum dots (QDs) in centered photonic structures. READ MORE

  4. 3. Cold amplification and fiber coupling of a super-conducting nanowire single-photon detector

    University essay from KTH/Tillämpad fysik

    Author : Stéphane Cohen; [2022]
    Keywords : Applied Physics; Tilllämpad fysik;

    Abstract : Single-photon detectors are an essential tool for quantum photonics: one can harness the quantum properties of single photons for quantum communication as well as use the detectors in low illumination applications.Superconducting nanowire single-photon detectors offer high detection efficiency over a widerange of wavelengths, low dark counts, and a good timing resolution compared to single-photonavalanche diodes. READ MORE

  5. 4. Design and Construction of a Multi-Port Beamsplitter Based on Few-Mode-Fibers

    University essay from Linköpings universitet/Informationskodning

    Author : Daniel Spegel-Lexne; [2022]
    Keywords : beamsplitter; spatial modes; Space division multiplexing; superpositions; LP-modes; few-mode fibers; multi-mode interference; self-imaging; heterogeneous fiber structures; quantum communication; quantum optics;

    Abstract : A MBS (Multi-port beamsplitter) for higher dimensional quantum communication has been designed and constructed and the theory and method for this is presented in this thesis. It uses optical fibers in a heterogeneous structure with a single-mode fiber spliced to a multi-mode fiber and then spliced to a few-mode fiber. READ MORE

  6. 5. Two-Photon Excitation of a GaAs Quantum Dot by Electro-Optically Modulating a Continuous Wave Laser

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Julia Schauman; Linnea Bendrot; [2020]
    Keywords : ;

    Abstract : One of the most important steps towards enabling quantum communication would be to successfully integrate single-photon emitters and quantum memories, enabling the development of quantum repeaters. This is why, as part of a larger project, the objective of this bachelor thesis was to retrieve single-photons suitable for storage inside a Rubidium-based quantum memory. READ MORE