Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Quantum Networks, Repeaters, and QKD III (joint session Q/QI)
Q 31.2: Vortrag
Mittwoch, 12. März 2025, 11:15–11:30, AP-HS
Indistinguishability of quantum-dot molecule based single photon sources — •Steffen Wilksen1, Alexander Steinhoff2, and Christopher Gies1 — 1Institut für Physik, Fakultät V, Carl von Ossietzky Universität Oldenburg — 2Institut für theoretische Physik, Universität Bremen
Quantum-dot molecules (QDMs) consist of two self-assembled semiconductor quantum dots on top of each other separated by a thin tunnelling barrier, allowing charge carriers to tunnel between dots and form delocalized states. Due to their high tunability and rich level scheme, they provide a promising entanglement-generation platform for use in quantum communication and measurement-based quantum computing.
A key property of the emitted individual photons is their indistinguishability. Due to interaction with the environment during the emission process, the photons lose their coherence and ability to interfere with one another. These influences are of particular relevance in semiconductor systems, and to minimize their effects, one aims to reduce external noise while decreasing the emission time using optical cavities.
We investigate the indistinguishability of single photons emitted from a QDM solving both the independent boson model and the Jaynes-Cummings model using both analytic and numerical approaches. We extend the independent-boson model to account for a more realistic behaviour of phonons while keeping it exactly solvable. When a cavity is included, we use exact diagonalization to calculate the attainable indistinguishability.
Keywords: Quantum-dot Molecule; Indistinguishability; Single photon source; Semiconductor quantum dot