Fig. 3: Experimental demonstration of a multiple access system.
From: Towards ubiquitous radio access using nanodiamond based quantum receivers
a Schematic illustration of the fluorescent nanodiamond (FND)-receiver for supporting a multiple access system. Users transmit reference bits followed by data transmission, resulting in reference images, i.e., fluorescence intensity matrix, composed of fluorescence intensity measurements of a region of the plate containing randomly placed FNDs. During data bits transmission, the fluorescence images are compared to the reference images to be demultiplexed using the minimum mean square error (MSE) criterion. b Reference images obtained in the frequency modulation experiment. The baseline corresponds to the fluorescence intensity matrix when both users simultaneously transmit bit “0”. The other three images represent the remaining three-bit combinations, with their differences from the baseline. c Reference images acquired in the amplitude modulation experiment, with the same interpretation as described. d Experiment involving the transmission of (Left) two digit images from MNIST Database30 and (Right) two subsampled face images from Yale Face Database31: Image messages transmitted by two users, image messages received during the frequency modulation experiment, and image messages received during the amplitude modulation experiment.
