{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T05:40:55Z","timestamp":1792129255896,"version":"4.4.0"},"reference-count":39,"publisher":"Optica Publishing Group","issue":"13","license":[{"start":{"date-parts":[[2024,6,6]],"date-time":"2024-06-06T00:00:00Z","timestamp":1717632000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2024,6,6]],"date-time":"2024-06-06T00:00:00Z","timestamp":1717632000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"name":"the Research Grants Council of the Hong Kong Special Administrative Region, China","award":["Project No. 16203317"],"award-info":[{"award-number":["Project No. 16203317"]}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2024,6,17]]},"abstract":"<jats:p>\n                    Polarization-entangled photon pair sources exhibiting nonlocal quantum correlations are crucial to developments of quantum computing, quantum communications, quantum cryptography, and quantum sensing technologies. On-chip polarization entanglement generation thus constitutes one enabling component for integrated quantum photonic circuits. Here, we present to our knowledge the first polarization-entangled photon pair sources in a silicon nitride platform for integrated quantum photonic circuits. We demonstrate the generation of a polarization-entangled state by adopting a configuration comprising dual microring resonators, with nearly degenerate transverse electric and transverse magnetic polarized cavity resonances for the two resonators coupled in series to a common bus waveguide. We measure two-photon interference and quantum state tomography to characterize the polarization entanglement of the generated state and to reconstruct the density matrix. Our experiments reveal a visibility of 96.4%\u2009\u00b1\u20093.1% and of 86.7%\u2009\u00b1\u20093.2% with the |\n                    <jats:italic>H<\/jats:italic>\n                    \u27e9 and |\n                    <jats:italic>V<\/jats:italic>\n                    \u27e9 bases, respectively (and a visibility of 89.4%\u2009\u00b1\u20096.6% and 81.3%\u2009\u00b1\u20097.3% with the |\n                    <jats:italic>D<\/jats:italic>\n                    \u27e9 and |\n                    <jats:italic>A<\/jats:italic>\n                    \u27e9 bases), and a fidelity of \u223c75.7% from the tomographic reconstructed density matrix.\n                  <\/jats:p>","DOI":"10.1364\/oe.518985","type":"journal-article","created":{"date-parts":[[2024,5,27]],"date-time":"2024-05-27T08:00:08Z","timestamp":1716796808000},"page":"22804","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Polarization entanglement generation in silicon nitride waveguide-coupled dual microring resonators"],"prefix":"10.1364","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3228-6173","authenticated-orcid":true,"given":"Qianni","family":"Zhang","sequence":"first","affiliation":[{"name":"The Hong Kong University of Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7141-7389","authenticated-orcid":true,"given":"Kaiyi","family":"Wu","sequence":"additional","affiliation":[{"name":"The Hong Kong University of Science and Technology"},{"name":"Purdue University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5222-8184","authenticated-orcid":true,"given":"Andrew W.","family":"Poon","sequence":"additional","affiliation":[{"name":"The Hong Kong University of Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2024,6,6]]},"reference":[{"key":"oe-32-13-22804-R1","doi-asserted-by":"publisher","first-page":"13465","DOI":"10.1038\/s41598-019-49805-7","volume":"9","author":"Mooney","year":"2019","journal-title":"Sci. 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