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However, up to now, no source has been shown to simultaneously exhibit the high pair-creation rate, broad bandwidth, excellent state fidelity, and low intrinsic loss necessary for gigabit secure key rates. In this work, we present for the first time a source of polarization-entangled photon pairs at telecommunication wavelengths that covers all these needs of real-world quantum-cryptographic applications, thus enabling unprecedented quantum-secure key rates of more than 1 Gbit\/s. Our source is designed to optimally exploit state-of-the-art telecommunication equipment and detection systems. Any technological improvement of the latter would result in an even higher rate without modification of the source. We discuss the used wavelength-multiplexing approach, including its potential for multi-user quantum networks and its fundamental limitations. Our source paves the way for high-speed quantum encryption approaching present-day internet bandwidth.<\/jats:p>","DOI":"10.22331\/q-2022-09-29-822","type":"journal-article","created":{"date-parts":[[2022,9,29]],"date-time":"2022-09-29T12:37:55Z","timestamp":1664455075000},"page":"822","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":31,"title":["Experimental entanglement generation for quantum key distribution beyond 1 Gbit\/s"],"prefix":"10.22331","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5968-5492","authenticated-orcid":false,"given":"Sebastian Philipp","family":"Neumann","sequence":"first","affiliation":[{"name":"Institute for Quantum Optics and Quantum Information, Boltzmanngasse 3, 1090 Vienna, Austria"},{"name":"Vienna Center for Quantum Science and Technology, Boltzmanngasse 5, 1090 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2291-997X","authenticated-orcid":false,"given":"Mirela","family":"Selimovic","sequence":"additional","affiliation":[{"name":"Institute for Quantum Optics and Quantum Information, Boltzmanngasse 3, 1090 Vienna, Austria"},{"name":"Vienna Center for Quantum Science and Technology, Boltzmanngasse 5, 1090 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3857-4555","authenticated-orcid":false,"given":"Martin","family":"Bohmann","sequence":"additional","affiliation":[{"name":"Institute for Quantum Optics and Quantum Information, Boltzmanngasse 3, 1090 Vienna, Austria"},{"name":"Vienna Center for Quantum Science and Technology, Boltzmanngasse 5, 1090 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9403-269X","authenticated-orcid":false,"given":"Rupert","family":"Ursin","sequence":"additional","affiliation":[{"name":"Institute for Quantum Optics and Quantum Information, Boltzmanngasse 3, 1090 Vienna, Austria"},{"name":"Vienna Center for Quantum Science and Technology, Boltzmanngasse 5, 1090 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"9598","published-online":{"date-parts":[[2022,9,29]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"S. 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