Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 19: Quantum Dots and Wires: Optics I
HL 19.7: Vortrag
Dienstag, 19. März 2024, 11:30–11:45, EW 202
Temperature-independent photon entanglement from quantum dots — •Thomas Bracht1,2, Moritz Cygorek3, Tim Seidelmann4, Vollrath Martin Axt4, and Doris E. Reiter2 — 1Institut für Festkörpertheorie, Uni Münster, DE — 2Condensed Matter Theory, TU Dortmund, DE — 3Heriot-Watt University, Edinburgh, UK — 4Theoretische Physik III, Universität Bayreuth, DE
High levels of entanglement are essential for reliable quantum communication. In this context, quantum dots have emerged as a promising platform, offering excellent photon properties and controllability.
Here, I propose a novel approach to achieve maximal entanglement, overcoming previous shortcoming for example in two-photon excitation. Building upon the Swing-Up of Quantum Emitter (SUPER) scheme, I demonstrate its efficiency in generating entangled photon pairs from quantum dot systems in optical cavities [1]. An important aspect of this approach is the decoupling of the preparation process from the subsequent photon emission, enabling an effective initial-value problem, previously inaccessible in two-photon absorption settings. By leveraging this decoupling, an entanglement with unprecedentedly high fidelity is achieved, even when accounting for phonon interaction at elevated temperatures up to 80K. This makes the approach interesting for the use in real-world quantum communication scenarios.
[1] T. K. Bracht et al., Optica Quantum (accepted, 2024)
Keywords: Entanglement; Cavity