Nonlinear interference in crystal superlattices  

作　　者：Anna V.Paterova Leonid A.Krivitsky 

机构地区：[1]Institute of Materials Research and Engineering(IMRE),Agency for Science Technology and Research(A*STAR),138634 Singapore,Singapore

出　　处：《Light(Science & Applications)》2020年第1期1239-1245,共7页光（科学与应用)（英文版）

基　　金：the support of the Quantum Technology for Engineering(QTE)programme of A*STAR and of the NRF CRP grant NRF—CRP14-2014-04.

摘　　要：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.

关 键 词：SPECTROSCOPY NONLINEAR NONLINEAR 

分 类 号：O17[理学—数学]