Abstract
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.
Highlights
Quantum metrology is the subject devoted to the fabrication and optimisation of high-precision interferometers
The linear interferometer is characterised by passive elements, such as beam splitters, which maintain the total number of photons throughout the entire interference process, whereas the nonlinear interferometer includes active elements, typically optical parametric amplifiers (OPAs), triggering the creation of photons
The spectral separation of signal and idler photons was achieved by the correct choice of the periodic pole of both parametric down-conversion (PDC) sources composing the interferometer
Summary
Quantum metrology is the subject devoted to the fabrication and optimisation of high-precision interferometers. The interest in integrated devices has recently grown due to both their small footprint and high efficiency [35–37] Such technologies are already utilised in quantum interference scenarios [38,39], in the realisation of non-degenerate PDC sources suitable for single-photon heralding [40], as well as in the generation of polarisation-entangled photons [41]. In this manuscript, we theoretically developed a spectrally multimode non-degenerate integrated SU(1,1) interferometer, whose signal and idler photons are spectrally distinguishable and orthogonally polarised.
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