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Entangled photons at 650 nm are generated in a bismuth barium borate (BiBO) crystal through type-I degenerate SPDC. The far field of the BiBO crystal is imaged onto two DMDs with a lens and a beam splitter (BS). One DMD is used to display the object we want to track, while the other is used to display random binary patterns. SPCMs are used for joint detection of the ghost and object photons.
Compressed ghost image of (a) the background of the scene and (b)–(f) the tracked object in different positions. These reconstructions were obtained by defining different vectors with 400 elements, corresponding to the number of measurements. The insets show the original frames of the scene displayed on the DMD.
Reconstructed ghost image of (a)–(e) tracked object with 200 measurements. (f)–(j) same object with 100 measurements.
Calculated mean-squared error of the compressed tracked object at the position shown in Fig. 2(b) . Green (red) line indicates the MSE using 400 (100) measurements. The thresholds indicate that a low quality image is retrieved and is not possible to track the object.
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