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Trapped Ion Quantum Computing

Indistinguishable photons from a two-photon cascade

arXiv

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

Year

2025

Paper ID

5919

Status

Preprint

Abstract Read

~2 min

Abstract Words

111

Citations

N/A

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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Decay of a four-level diamond scheme via a cascade is a potential source of entangled photon pairs.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2512.16617 [2] arXiv https://arxiv.org/abs/2512.16617 [3] Publisher https://arxiv.org/abs/2512.16617

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