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However, rapidly developing integrated technologies provide higher efficiencies, smaller footprints, and pave the way to quantum-enhanced on-chip interferometry. In this work, we theoretically realised an integrated architecture of the multimode SU(1,1) interferometer which can be applied to various integrated platforms. The presented interferometer includes a polarization converter between two photon sources and utilizes a continuous-wave (CW) pump. Based on the potassium titanyl phosphate (KTP) platform, we show that this configuration results in almost perfect destructive interference at the output and supersensitivity regions below the classical limit. In addition, we discuss the fundamental difference between single-mode and highly multimode SU(1,1) interferometers in the properties of phase sensitivity and its limits. Finally, we explore how to improve the phase sensitivity by filtering the output radiation and using different seeding states in different modes with various detection strategies.<\/jats:p>","DOI":"10.22331\/q-2021-05-27-461","type":"journal-article","created":{"date-parts":[[2021,5,27]],"date-time":"2021-05-27T12:39:16Z","timestamp":1622119156000},"page":"461","update-policy":"http:\/\/dx.doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":21,"title":["Spectrally multimode integrated SU(1,1) interferometer"],"prefix":"10.22331","volume":"5","author":[{"given":"Alessandro","family":"Ferreri","sequence":"first","affiliation":[{"name":"Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany"}]},{"given":"Matteo","family":"Santandrea","sequence":"additional","affiliation":[{"name":"Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany"}]},{"given":"Michael","family":"Stefszky","sequence":"additional","affiliation":[{"name":"Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany"}]},{"given":"Kai H.","family":"Luo","sequence":"additional","affiliation":[{"name":"Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany"}]},{"given":"Harald","family":"Herrmann","sequence":"additional","affiliation":[{"name":"Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany"}]},{"given":"Christine","family":"Silberhorn","sequence":"additional","affiliation":[{"name":"Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany"}]},{"given":"Polina R.","family":"Sharapova","sequence":"additional","affiliation":[{"name":"Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany"}]}],"member":"9598","published-online":{"date-parts":[[2021,5,27]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"M. 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