Electric-field control of photon indistinguishability in cascaded decays in quantum dots

• URL: http://arxiv.org/abs/2502.20093v1
• Date: Thu, 27 Feb 2025 13:52:07 GMT
• Title: Electric-field control of photon indistinguishability in cascaded decays in quantum dots
• Authors: Gabriel Undeutsch, Maximilian Aigner, Ailton J. Garcia Jr., Johannes Reindl, Melina Peter, Simon Mader, Christian Weidinger, Saimon F. Covre da Silva, Santanu Manna, Eva Schöll, Armando Rastelli,
• Abstract summary: Decay cascades in quantum emitters offer a simple method to create entangled photon-pairs.<n>Indistinguishability of photons emitted in a cascade is intrinsically limited by the lifetime ratio of the involved transitions.<n>We show that, for the biexciton-exciton cascade in a quantum dot, this ratio can be widely tuned by an applied electric field.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Photon indistinguishability, entanglement, and antibunching are key ingredients in quantum optics and photonics. Decay cascades in quantum emitters offer a simple method to create entangled photon-pairs with negligible multi-pair generation probability. However, the degree of indistinguishability of the photons emitted in a cascade is intrinsically limited by the lifetime ratio of the involved transitions. Here we show that, for the biexciton-exciton cascade in a quantum dot, this ratio can be widely tuned by an applied electric field. Hong-Ou-Mandel interference measurements of two subsequently emitted biexciton photons show that their indistinguishability increases with increasing field, following the theoretically predicted behavior. At the same time, the emission linewidth stays close to the transform-limit, favoring applications relying on the interference among photons emitted by different sources.

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