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28 May 2014 Photon-sparse heralded imaging
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How many photons does it take to form an image? Although a single photon can be spatially encoded to carry large amounts of information, real images are not fully orthogonal to each other and hence, realistically, require many detected photons to distinguish between them. Even if one has access to a pixelated imaging detector with high quantum efficiency, the fidelity of a recorded, or inferred, image depends critically upon the dark counts from the detector. Here we present imaging using heralded single-photons and a time-gated intensified camera to all but eliminate noise-events, and record images of a standard test-target. The images are formed from only a few thousand photons and are therefore subject to a noise inherent within the Poissonian distribution of single-photon events. We apply techniques of compressive sensing and image regularization to obtain good estimates of the object, obtained for ultra-low optical exposures.
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Peter A. Morris, Reuben S. Aspden, Jessica Bell, Daniel S. Tasca, Robert W. Boyd, and Miles J. Padgett "Photon-sparse heralded imaging", Proc. SPIE 9114, Advanced Photon Counting Techniques VIII, 91140B (28 May 2014); doi: 10.1117/12.2053220;

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