Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.37: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Collective Driving of Many-Photon Quantum States — •Gabriela Carla Silva Militani1, Moritz Kaiser1, René Schwarz1, Ria Krämer2, Stefan Nolte2, Philip Poole3, Dan Dalacu3, Gregor Weihs1, and Vikas Remesh1 — 1Institute for Experimental Physics, University of Innsbruck, Technikerstrasse 25d, 6020 Innsbruck, Austria — 2Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany — 3National Research Council Canada, Ottawa, ON K1A 0R6, Canada
This work aims to present the simultaneous excitation of two uncoupled InP/InAsP quantum dots embedded in a nanowire. Our excitation method is the two-photon excitation adiabatic rapid passage, by which both dots are excited to their biexciton state and subsequently emit polarization-entangled photon pairs in a cascade. In this scheme, a pulsed laser tuned to the two-photon resonance is chirped using a custom-designed chirped fiber Bragg grating (CFBG). The resulting spectral phase variation induces an adiabatic population transfer in the dot. Because of this, the biexciton state population does not exhibit Rabi rotations under a pulse area scan. In other words, our excitation method is robust and insensitive to laser power and frequency fluctuations. Taking advantage of this, we simultaneously excite both dots and demonstrate the generation of two pairs of entangled photon states. Our work paves the way for the scalable generation of multiphoton entangled states for advanced quantum technology applications.
Keywords: quantum dots; excitation schemes; tomography; entanglement