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Universal, phase-stable, reconfigurable multimode interferometers (quantum photonic processors) enable manipulation of photonic quantum states and are one of the main components of photonic quantum computers in various architectures. In this paper, we report the realization of the largest quantum photonic processor to date. The processor enables arbitrary unitary transformations on its 20 input modes with an amplitude fidelity of F<\/mml:mi>Haar<\/mml:mtext><\/mml:mrow><\/mml:msub>=<\/mml:mo>97.4<\/mml:mn>&#x0025;<\/mml:mi><\/mml:math> and F<\/mml:mi>Perm<\/mml:mtext><\/mml:mrow><\/mml:msub>=<\/mml:mo>99.5<\/mml:mn>&#x0025;<\/mml:mi><\/mml:math> for Haar-random and permutation matrices, respectively, an optical loss of 2.9 dB averaged over all modes, and high-visibility quantum interference with V<\/mml:mi>HOM<\/mml:mtext><\/mml:mrow><\/mml:msub>=<\/mml:mo>98<\/mml:mn>&#x0025;<\/mml:mi><\/mml:math>. The processor is realized in S<\/mml:mi>i<\/mml:mi>3<\/mml:mn><\/mml:msub>N<\/mml:mi>4<\/mml:mn><\/mml:msub><\/mml:mrow><\/mml:math> waveguides and is actively cooled by a Peltier element.<\/jats:p>","DOI":"10.22331\/q-2023-08-01-1071","type":"journal-article","created":{"date-parts":[[2023,8,1]],"date-time":"2023-08-01T14:08:02Z","timestamp":1690898882000},"page":"1071","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":73,"title":["20-Mode Universal Quantum Photonic Processor"],"prefix":"10.22331","volume":"7","author":[{"given":"Caterina","family":"Taballione","sequence":"first","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Malaquias Correa","family":"Anguita","sequence":"additional","affiliation":[{"name":"MESA+ Institute for Nanotechnology, University of Twente, 7522 NB Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michiel","family":"de Goede","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pim","family":"Venderbosch","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ben","family":"Kassenberg","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henk","family":"Snijders","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Narasimhan","family":"Kannan","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ward L.","family":"Vleeshouwers","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"},{"name":"QuSoft, 1098 XG Amsterdam, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Devin","family":"Smith","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00f6rn P.","family":"Epping","sequence":"additional","affiliation":[{"name":"QuiX Quantum B.V., 7521 AN Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reinier","family":"van der Meer","sequence":"additional","affiliation":[{"name":"MESA+ Institute for Nanotechnology, University of Twente, 7522 NB Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pepijn W. 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