Split a beam of light in two and direct one beam (the reference) to a multipixel camera and the other (the signal) to an object to be imaged and to a single-pixel detector beyond it. Measuring correlations between photon arrival times at the two detectors enables the object to be imaged by the camera despite the reference beam not interacting with the object. Now Meixue Chen at Xi’an Jiaotong University in China and her colleagues have demonstrated an even stranger version of this technique: They construct an image by discarding every signal-beam photon that interacts with the object [1].
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