Shahram Panahiyan
Recent decades have witnessed the production and utilization of non-classical sources of light in the fundamental studies and technological applications of the quantum mechanic. Among these sources of light, squeezed light is a celebrated one which has been used for interdisciplinary applications ranging from detection of the gravitational waves [1] to quantum imaging [2] and spectroscopy [3]. The main feature of the squeezed light is reduced quantum fluctuations at one quadrature at the expense of increased fluctuations in the other quadrature. This feature enables the squeezed light to beat the standard quantum limit and obtain an improved signal-to-noise ratio. Inspired by this feature, we investigated what’s the best way of detecting signals in nonlinear light-matter interactions [4]. We used a nonlinear interferometer as a platform to produce and engineer squeezed light before and after interacting with matter. We show that with proper optimization of the interferometer, the detection of the signal of the multiphoton absorption processes improves significantly compared to detection with classical sources of light. We scrutinize this improvement by considering realistic experimental shortcomings and confirm that measurement with squeezed light outperforms measurement with classical light fields.
[1] T. Eberle et al., Phys. Rev. Lett. 104, 251102 (2010)[2] G. Brida, M. Genovese, and I. Ruo Berchera, Nature Photonics 4, 227 (2010)
[3] C. A. Casacio et al., Nature 594, 201 (2021)
[4] S. Panahiyan, C. S. Mun ̃oz, M. V. Chekhova, F. Schlawin, [arXiv:2209.02697]