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

• URL: http://arxiv.org/abs/2308.02422v1
• Date: Fri, 4 Aug 2023 16:07:12 GMT
• Title: Generation and characterization of polarization-entangled states using quantum dot single-photon sources
• Authors: Mauro Valeri, Paolo Barigelli, Beatrice Polacchi, Giovanni Rodari, Gianluca De Santis, Taira Giordani, Gonzalo Carvacho, Nicol\`o Spagnolo and Fabio Sciarrino
• Abstract summary: Single-photon sources based on semiconductor quantum dots find several applications in quantum information processing. We implement this approach via a simple and compact design that generates entangled photon pairs in the polarization degree of freedom. Our source shows long-term stability and high quality of the generated entangled states, thus constituting a reliable building block for optical quantum technologies.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Single-photon sources based on semiconductor quantum dots find several applications in quantum 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 a possible solution relying on the interference in probabilistic gates of identical photons emitted at different pulses from the same source. In this work, we implement this approach via a simple and compact design that generates entangled photon pairs in the polarization degree of freedom. We operate the proposed platform with single photons produced through two different pumping schemes, the resonant excited one and the longitudinal-acoustic phonon-assisted configuration. We then characterize the produced entangled two-photon states by developing a complete model taking into account relevant experimental parameters, such as the second-order correlation function and the Hong-Ou-Mandel visibility. Our source shows long-term stability and high quality of the generated entangled states, thus constituting a reliable building block for optical quantum technologies.

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