Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: QuanTour II – Multi-photon Effects & Entanglement
Q 20.5: Talk
Tuesday, March 3, 2026, 12:15–12:30, P 7
Scalable quantum interference of photons from multiple quantum dots. — •Sheena Shaji1, Suraj Goel1, Julian Weircinski1, Frederik Brooke Barnes1, Moritz Cygorek2, Antoine Borel1, Natalia Herrera Valencia1, Erik M. Gauger1, Mehul Malik1, and Brian D. Gerardot1 — 1Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom — 2Condensed Matter Theory, Technical University of Dortmund, 44227 Dortmund, Germany
Scaling semiconductor quantum dots as platform to provide many mutually indistinguishable emitters remain has been a challenge due to their random spatial distribution and spectral inhomogeneity. In this talk, I will present a method to overcome these challenges using spatial light modulators to deterministically excite multiple emitters on the same chip, and to route their emission into a desired collection mode by programming phase grating holograms on them. We investigate cooperative emission arising from path erasure between distant, indistinguishable emitters. The primary signature of multi-emitter quantum interference, the emergence of bunching at zero delay in an intensity correlation experiment, is used to characterize the inter-emitter indistinguishability and the degree of correlation. We demonstrate scalability of this interference from two to five spectrally degenerate quantum dots and further confirm inter-emitter indistinguishability through Hong-Ou-Mandel interference between two emitters. These results provide a pathway towards rapid characterization of multiple emitters and realization of programmable, photonic quantum circuits.
Keywords: quantum dots; interference; indistinguishable photons; single photon sources