{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T12:48:02Z","timestamp":1785415682855,"version":"3.56.0"},"reference-count":36,"publisher":"Optica Publishing Group","issue":"15","license":[{"start":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T00:00:00Z","timestamp":1784851200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T00:00:00Z","timestamp":1784851200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"name":"European Research Council","award":["101116943"],"award-info":[{"award-number":["101116943"]}],"id":[{"id":"https:\/\/ror.org\/0472cxd90","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2026,7,27]]},"abstract":"<jats:p>Time-correlated single-photon counting (TCSPC) is a pivotal technique for time-resolved photonic applications requiring exceptional temporal resolution. Unfortunately, conventional TCSPC has long been confined to a low-speed regime due to pile-up distortion, commonly regarded as a statistical bias favoring the detection of early-arriving photons within each excitation cycle at high count rates. A recently introduced measurement strategy theoretically extends distortion-free TCSPC operation into the multi-photon regime by leveraging an auxiliary histogram alongside the conventional photon arrival-time distribution, which explicitly maps the time-resolved availability of the detection system. Within this framework, pile-up distortion is recast as a deterministic consequence of the time-varying sensitivity of the detection system and can be eliminated through direct measurement of its operational state. However, real-time operation remains precluded by the sequential construction of the auxiliary histogram, as implemented in existing reconstruction schemes. To address this limitation, we introduce a fully parallel approach that removes this computational bottleneck, advancing TCSPC techniques to more practical applications beyond laboratory settings. We present a closed-form formulation of the proposed strategy and demonstrate its experimental validation on dedicated modern processing architectures.<\/jats:p>","DOI":"10.1364\/oe.605727","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T14:00:15Z","timestamp":1782482415000},"page":"28692","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fully parallel correction algorithm for real-time distortion-free TCSPC operation via direct dead time measurement"],"prefix":"10.1364","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-0573-2489","authenticated-orcid":true,"given":"Gennaro","family":"Fratta","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01nffqt88","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivan","family":"Labanca","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01nffqt88","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-0466-0283","authenticated-orcid":true,"given":"Piergiorgio","family":"Daniele","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01nffqt88","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3190-4953","authenticated-orcid":true,"given":"Giulia","family":"Acconcia","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01nffqt88","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1430-1010","authenticated-orcid":true,"given":"Ivan","family":"Rech","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01nffqt88","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,7,24]]},"reference":[{"key":"oe-34-15-28692-R1","author":"Becker","year":"2005"},{"key":"oe-34-15-28692-R2","author":"Becker","year":"2015"},{"key":"oe-34-15-28692-R3","doi-asserted-by":"publisher","first-page":"012003","DOI":"10.1088\/1361-6501\/28\/1\/012003","type":"journal-article","volume":"28","author":"Hirvonen","year":"2016","journal-title":"Meas. 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