Phys.org June 5, 2023
The ability to use the temporal and spatial degrees of freedom of quantum states of light to encode and transmit information is crucial for a robust and efficient quantum network. However, the potential offered by the large dimensionality of the spatial degree of freedom remains unfulfilled, as the necessary level of control required to encode information remains elusive. Researchers at the University of Oklahoma encoded information in the distribution of the spatial correlations of entangled twin beams by taking advantage of their dependence on the angular spectrum of the pump needed for four-wave mixing. They showed that the encoded information could only be extracted through joint spatial measurements of the twin beams and not through individual beam measurements and that the temporal quantum correlations were not modified. The ability to engineer the spatial properties of twin beams will enable high-capacity quantum networks and quantum-enhanced spatially resolved sensing and imaging… read more. Open Access TECHNICAL ARTICLEÂ
Experimental setup for encoding information… Credit: SCIENCE ADVANCES, 2 Jun 2023, Vol 9, Issue 22Â