2019/10/23 by Anna V. Paterova, Leonid A. Krivitsky · 39 citations
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Artificial intelligence #Astronomical interferometer #Computer science #Electronic engineering #Engineering #Interference (communication) #Interferometry #Metrology #Noise (video) #Nonlinear system #Optics #Optoelectronics #Photonic and Optical Devices #Photorefractive and Nonlinear Optics #Physics #Quantum mechanics #Sensitivity (control systems) #Superlattice #Telecommunications #physics.optics #quant-ph
paper · pdf · doi:10.1038/s41377-020-0320-1
published in Light Science & Applications 9(1), 82 (Springer Nature)
arxiv created 2019/10/23 · openalex publication_date 2020/05/09 · arxiv updated 2020/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Nonlinear interferometers with correlated photons hold promise to advance optical characterization and metrology techniques by improving their performance and affordability. These interferometers offer subshot noise phase sensitivity and enable measurements in detection-challenging regions using inexpensive and efficient components. The sensitivity of nonlinear interferometers, defined by the ability to measure small shifts of interference fringes, can be significantly enhanced by using multiple nonlinear elements, or crystal superlattices. However, to date, experiments with more than two nonlinear elements have not been realized, thus hindering the potential of nonlinear interferometers. Here, we build a nonlinear interferometer with up to five nonlinear elements, referred to as superlattices, in a highly stable and versatile configuration. We study the modification of the interference pattern for different configurations of the superlattices and perform a proof-of-concept gas sensing experiment with enhanced sensitivity. Our approach offers a viable path towards broader adoption of nonlinear interferometers with correlated photons for imaging, interferometry, and spectroscopy.