Sep 16, 2016, 11:30 AM
Morgan Weston, Griffith University, Australia. Entanglement is a key resource to many quantum information protocols, making rigorous verification of remote shared entanglement highly sought after. We design and experimentally implement a new heralded quantum steering protocol in order to verify shared entanglement over a high loss quantum channel, with the detection loophole closed. Our scheme uses entanglement swapping with two high-performance telecom-wavelength, polarisation-entangled photon sources and highly efficient detectors. Our approach has demonstrated violation of the steering inequality by two standard deviations with 14.8 dB of added channel loss, equivalent to approximately 80km of telecom fibre.