Vorarlberg University of Applied Sciences
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Quantum teleportation with dissimilar quantum dots over a hybrid quantum network
No full textPhotonic quantum information processing in metropolitan quantum networks lays the foundation for cloud quantum computing, secure communication, and the realization of a global quantum internet. This paradigm shift requires on-demand and high-rate generation of flying qubits and their quantum state teleportation over long distances. Despite the last decade has witnessed an impressive progress in the performances of deterministic photon sources, the exploitation of distinct quantum emitters to implement a quantum relay among distant parties has remained elusive. Here, we overcome this challenge by using dissimilar quantum dots whose electronic and optical properties are engineered by light-matter interaction, multi-axial strain and magnetic fields so as to make them suitable for the teleportation of polarization qubits. This is demonstrated in a quantum network harnessing both fiber connections and a 270 m free-space optical link connecting two buildings of the Sapienza University campus in Rome. The protocol exploits GPS-assisted synchronization, ultra-fast single photon detectors as well as stabilization systems that compensate for atmospheric turbulence. The achieved teleportation state fidelity reaches up to 82 ± 1%, above the classical limit by more than 10 standard deviations. Our field demonstration of all-photonic quantum teleportation opens a new route to implement solid-state based quantum relays and builds the foundation for practical quantum networks
Remembering the unremembered: Play-based education on Nazi euthanasia
No full textDieser Aufsatz untersucht die pädagogischen Möglichkeiten von antifaschistischer Erziehung in der Offenen Jugendarbeit am Beispiel Vorarlberger Denkmäler für die Ermordeten der NS-Euthanasie
Canalization-based super-resolution imaging using an individual van der Waals thin layer
Get PDFCanalization is an optical phenomenon that enables unidirectional light propagation without predefined waveguiding designs. Recently demonstrated using phonon polaritons in twisted van der Waals (vdW) layers of α-MoO3, it offers unprecedented possibilities for controlling light-matter interactions at the nanoscale. However, practical applications have been hindered by the complex sample fabrication of twisted stacks. In this work, we introduce a previously unexplored canalization phenomenon in a single-thin vdW layer (α-MoO3) interfaced with a substrate exhibiting a given negative permittivity. This enables a proof-of-concept application of polariton canalization: super-resolution nanoimaging (~λ0/220). Canalization-based imaging transcends conventional projection constraints, allowing the super-resolution images to be obtained at any desired location in the image plane. This versatility stems from the synergetic manipulation of three key parameters: incident frequency, rotation angle of the thin vdW layer, and thickness. Our results provide insights into the properties of canalization and constitute a seminal step toward multifaceted photonic applications, including imaging, data transmission, and ultracompact photonic integration
Risikomanagementstrategien bei Investitionsentscheidungen unter geopolitischen Risiken
Get PDFDiese Masterarbeit untersucht, wie exportorientierte Industrieunternehmen in Vorarlberg mit geopolitischen Risiken im Kontext von Investitionsentscheidungen umgehen. Im Mittelpunkt steht eine integrative Betrachtung der vier Phasen des Risikomanagementprozesses: Identifikation, Bewertung, Steuerung und Überwachung. Vor dem Hintergrund wachsender globaler Instabilität wurde eine qualitative Erhebung in Form von sechs Experteninterviews mit Führungskräften mittelständischer Unternehmen durchgeführt, um strategische Ansätze und bestehende Herausforderungen systematisch zu erfassen. Die Ergebnisse zeigen, dass geopolitische Entwicklungen als zentrale Einflussfaktoren auf Investitionen wahrgenommen werden. Die befragten Unternehmen kombinieren externe und interne Informationsquellen, bewerten Risiken mithilfe qualitativer und quantitativer Verfahren und setzen vielfältige Maßnahmen zur Steuerung und Überwachung ein. Die Untersuchung leitet praxisorientierte Handlungsempfehlungen zur Weiterentwicklung des Risikomanagements ab und leistet einen empirisch fundierten Beitrag zur Schließung der Forschungslücke im investitionsbezogenen Umgang mit geopolitischen Disruptionen
