TY  - JOUR
AU  - Sharapova, Polina R.
AU  - Ferreri, Alessandro
TI  - Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer
JO  - Symmetry
VL  - 14
IS  - 3
SN  - 2073-8994
CY  - Basel
PB  - MDPI
M1  - FZJ-2022-01721
SP  - 552 -
PY  - 2022
AB  - Multimode integrated interferometers have great potential for both spectral engineering and metrological applications. However, the material dispersion of integrated platforms constitutes an obstacle that limits the performance and precision of such interferometers. At the same time, two-colour nonlinear interferometers present an important tool for metrological applications, when measurements in a certain frequency range are difficult. In this manuscript, we theoretically developed and investigated an integrated multimode two-colour SU(1,1) interferometer operating in a supersensitive mode. By ensuring the proper design of the integrated platform, we suppressed the dispersion, thereby significantly increasing the visibility of the interference pattern. The use of a continuous wave pump laser provided the symmetry between the spectral shapes of the signal and idler photons concerning half the pump frequency, despite different photon colours. We demonstrate that such an interferometer overcomes the classical phase sensitivity limit for wide parametric gain ranges, when up to 3×104 photons are generated.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000774567800001
DO  - DOI:10.3390/sym14030552
UR  - https://juser.fz-juelich.de/record/906827
ER  -