{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T02:30:09Z","timestamp":1789093809537,"version":"build-2803163510"},"reference-count":37,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T00:00:00Z","timestamp":1773964800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T00:00:00Z","timestamp":1773964800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Nanophotonics"],"published-print":{"date-parts":[[2026,3,27]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    High\u2010brightness\u2013integrated quantum light sources represent a fundamental element for large\u2010scale photonic quantum technologies. Integrated microring resonator (MRR) in highly nonlinear and ultralow\u2010loss material platforms enable entangled photon\u2010pair generation, but device performance is affected by fabrication tolerances and can thus not be judiciously controlled. Redundant designs based on parameter variation are impractical for chip\u2010scale circuits, as the sheer number of parameters would be too complex. To address this, passive photonic circuits must be combined with active control elements to optimize photon\u2010pair emission and to match emission characteristics among sources. Here, we present a comprehensive study of an actively tunable, interferometrically coupled integrated MRR implemented in silicon nitride (SiN). By manipulating two thermally controlled phase shifters, the ring\u2013bus coupling and the resonator phase can be dynamically adjusted, enabling post\u2010fabrication control of its quality factor (Q\u2010factor) between 10\n                    <jats:sup>5<\/jats:sup>\n                    and 10\n                    <jats:sup>6<\/jats:sup>\n                    to optimize the photon emission bandwidth and the pair generation rate. We directly demonstrate for the first time that the optimal coupling and emission characteristics do not occur at critical coupling and vary across frequency modes due to dispersion effects, in good agreement with our theoretical model. These findings highlight the role of adaptive integrated photon sources for single\u2010batch fabrication of reconfigurable devices with application\u2010specific spectral properties.\n                  <\/jats:p>","DOI":"10.1002\/nap2.70043","type":"journal-article","created":{"date-parts":[[2026,3,21]],"date-time":"2026-03-21T05:28:47Z","timestamp":1774070927000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Tunable Coupler\u2013Augmented Microrings: Reconfigurable Q\u2010Factor Control for Foundry\u2010Scale Quantum Light Sources"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-7093-4719","authenticated-orcid":false,"given":"Jan","family":"Heine","sequence":"first","affiliation":[{"name":"Institute of Photonics (IOP) Leibniz University Hannover  Hannover Germany"},{"name":"Hannover Centre for Optical Technologies Leibniz University Hannover  Hannover Germany"},{"name":"Cluster of Excellence PhoenixD Leibniz University  Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7375-9101","authenticated-orcid":false,"given":"Juan Samuel Sebasti\u00e1n","family":"Dur\u00e1n G\u00f3mez","sequence":"additional","affiliation":[{"name":"Institute of Photonics (IOP) Leibniz University Hannover  Hannover Germany"},{"name":"Hannover Centre for Optical Technologies Leibniz University Hannover  Hannover Germany"},{"name":"Cluster of Excellence PhoenixD Leibniz University  Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5323-3850","authenticated-orcid":false,"given":"Michael","family":"Kues","sequence":"additional","affiliation":[{"name":"Institute of Photonics (IOP) Leibniz University Hannover  Hannover Germany"},{"name":"Hannover Centre for Optical Technologies Leibniz University Hannover  Hannover Germany"},{"name":"Cluster of Excellence PhoenixD Leibniz University  Hannover 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