Generation and characterization of polarization-entangled states using quantum dot single-photon sources

• DOI: 10.48550/arxiv.2308.02422
• Publication Date: 2023-01-01
• Authors: Mauro Valeri; Paolo Barigelli; Beatrice Polacchi; Giovanni Rodari; Gianluca De Santis; Taira Giordani; Gonzalo Carvacho; Nicolò Spagnolo; Fabio Sciarrino
• Keywords: Photon entanglement; Spontaneous parametric down-conversion

Single-photon sources based on semiconductor quantum dots find several applications in information processing due to their high single-photon indistinguishability, on-demand generation, and low multiphoton emission. In this context, the generation of entangled photons represents a challenging task with possible solution relying interference probabilistic gates identical emitted at different pulses from same source. work, we implement approach via simple compact design that generates photon pairs polarization degree freedom. We operate proposed platform single produced through two pumping schemes, resonant excited one longitudinal-acoustic phonon-assisted configuration. then characterize two-photon states by developing complete model taking into account relevant experimental parameters, such as second-order correlation function Hong-Ou-Mandel visibility. Our source shows long-term stability quality generated states, thus constituting reliable building block for optical technologies.