Scientists are continually striving to enhance the precision of interferometric sensing, a technique vital for applications ranging from imaging to lithography, and now Samata Gokhale and Netanel P. Yaish, working with colleagues at the Department of Physics and BINA Center for Nanotechnology, Bar-Ilan University, have demonstrated a novel approach to sensing birefringence beyond conventional limits. Their research details an interferometric scheme utilising hyper-entanglement within a pair of nonlinear SU(1,1) interferometers, coupled by birefringence, to detect minute phase shifts with increased sensitivity. This work, conducted in collaboration with Yogesh Dandekar and Avi Pe’er from the Department of Physics, Bar-Ilan University, is significant because the…