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Stimulated Generation of Indistinguishable Single Photons from a Quantum Ladder System

Friedrich Sbresny, Lukas Hanschke, Eva Schöll, William Rauhaus, Bianca Scaparra, Katarina Boos, Eduardo Zubizarreta Casalengua, Hubert Riedl, Elena del Valle, Jonathan James Finley, Klaus D. Jöns, Kai Müller

Published Jan 1, 2023• 3 citations
Publisher

Abstract

Single photons play a key role for applications in photonic quantum technologies. Here we propose, model and demonstrate a scheme that enables the generation of high purity indistinguishable single photons from a quantum ladder system.
DOI
10.1364/cleo_fs.2023.fth3a.7

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We propose a scheme for the generation of highly indistinguishable single photons using semiconductor quantum dots and demonstrate its performance and potential. The scheme is based on the resonant two-photon excitation of the biexciton followed by stimulation of the biexciton to selectively prepare an exciton. Quantum-optical simulations and experiments are in good agreement and show that the scheme provides significant advantages over previously demonstrated excitation methods. The two-photon excitation of the biexciton suppresses re-excitation and enables ultralow multiphoton errors, while the precisely timed stimulation pulse results in very low timing jitter of the photons, and consequently, high indistinguishability. In addition, the polarization of the stimulation pulse allows us to deterministically program the polarization of the emitted photon (H or V). This ensures that all emission of interest occurs in the polarization of the detection channel, resulting in higher brightness than cross-polarized resonant excitation.