Indistinguishable photons from a two-photon cascade
- URL: http://arxiv.org/abs/2512.16617v1
- Date: Thu, 18 Dec 2025 14:53:26 GMT
- Title: Indistinguishable photons from a two-photon cascade
- Authors: Timon L. Baltisberger, Francesco Salusti, Mark R. Hogg, Malwina A. Marczak, Nils Heinisch, Sascha R. Valentin, Stefan Schumacher, Arne Ludwig, Klaus D. Jöns, Richard J. Warburton,
- Abstract summary: Decay of a four-level diamond scheme via a cascade is a potential source of entangled photon pairs.<n>High entanglement fidelities have been demonstrated, but the two photons, XX and X, are temporally correlated.<n>We find that the photon coherence follows the well-known quantum optics result upon tuning the XX:X lifetime ratio.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Decay of a four-level diamond scheme via a cascade is a potential source of entangled photon pairs. A solid-state implementation is the biexciton cascade in a semiconductor quantum dot. While high entanglement fidelities have been demonstrated, the two photons, XX and X, are temporally correlated, typically resulting in poor photon coherence. Here, we demonstrate a high two-photon interference visibility (a measure of the photon coherence) for both XX (V=94$\pm$2%) and X (V=82$\pm$6%) photons. This is achieved by Purcell-enhancing the biexciton transition in a low-noise device. We find that the photon coherence follows the well-known quantum optics result upon tuning the XX:X lifetime ratio over two orders of magnitude.
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