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Q: Fachverband Quantenoptik und Photonik
Q 20: QuanTour II – Multi-photon Effects & Entanglement
Q 20.2: Talk
Tuesday, March 3, 2026, 11:30–11:45, P 7
Indistinguishable photons from a two-photon cascade — •Timon L. Baltisberger1, Francesco Salusti2, Mark R. Hogg1, Malwina A. Marczak1, Nils Heinisch2, Sascha R. Valentin3, Arne Ludwig3, Stefan Schumacher2, Klaus D. Jöns2, and Richard J. Warburton1 — 1Department of Physics, University of Basel, Switzerland — 2Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP), Paderborn University, Germany — 3Lehrstuhl für angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany
Two crucial aspects of photon-based quantum technologies are indistinguishability and entanglement, both giving rise to a wide range of non-classical effects. The biexciton → exciton → ground state (XX → X → GS) cascade in self-assembled semiconductor quantum dots can produce polarization-entangled photon pairs [1]. However, the cascaded emission of this ladder system leads to timing jitter in photon emission, translating to a reduced indistinguishability of photons from both transitions [2]. Using the Purcell-effect in an open microcavity [3] to accelerate one transition of the two-step-cascade, we manipulate the timing jitter of the emitted photons in-situ. Our results show excellent agreement between theory and experiments over a wide range of parameters, and the generation of photons with very high indistinguishabilities of 94±2% (XX) and 82±6% (X).
[1] N. Akopian et al. Phys. Rev. Lett. 96, 130501 (2006)
[2] E. Schöll et al. Phys. Rev. Lett. 125, 233605 (2020)
[3] N. Tomm et al. Nat. Nanotechnol. 16, 399 (2021)
Keywords: Self-assembled semiconductor quantum dots; Biexciton cascade; Indistinguishability