https://doi.org/10.1140/epjp/s13360-024-05034-0
Regular Article
Quantum enhancement of phase sensitivity for SU(1,1) interferometer via low-noise boost of phase sensing photons using non-Gaussianity
Department of Physics, Hangzhou Dianzi University, 310018, Hangzhou, China
Received:
30
October
2023
Accepted:
23
February
2024
Published online:
11
March
2024
We propose to utilize photon-addition-then-subtraction (PATS) scheme to enhance the phase sensitivity of SU(1,1) interferometer (SUI). By performing PATSs on the internal arms of the SUI, we demonstrate that the phase sensing photon number (PSPN) inside the interferometer can be increased efficiently. The extra noise addition caused by such PSPN boost is very low. It is the low-noise boost of the PSPN that leads to the quantum enhancement of the PATS-based SUI. We demonstrate that the PATS scheme can improve the robustness of the SUI against internal loss of the interferometer, which is one of the main limitations degrades the performance of the standard SUI. In addition, we also find that the PATS-based SUI is capable of mitigating the saturation effect of the detector, when the input of the interferometer is small.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
