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<p><b>Ghost imaging</b> (also called "coincidence imaging", "two-photon imaging" or "correlated-photon imaging") is a technique that produces an <a href="page.php?w=image">image</a> of an object by combining information from two light detectors:  a conventional, multi-<a href="page.php?w=pixel">pixel</a> detector that does not view the object, and a single-pixel (bucket) detector that does view the object. Two techniques have been demonstrated.  A <a href="page.php?w=Quantum_mechanics">quantum</a> method uses a source of pairs of <a href="page.php?w=quantum_entanglement">entangled</a></p><p>
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