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We demonstrate experimentally and theoretically that a coherent image of apure phase object may be obtained by use of a spatially incoherent illuminationbeam. This is accomplished by employing a two-beam source of entangled photonsgenerated by spontaneous parametric down-conversion. Though each of the beamsis, in and of itself, spatially incoherent, the pair of beams exhibitshigher-order inter-beam coherence. One of the beams probes the phase objectwhile the other is scanned. The image is recorded by measuring the photoncoincidence rate using a photon-counting detector in each beam. Using areflection configuration, we successfully imaged a phase object implemented bya MEMS micro-mirror array. The experimental results are in accord withtheoretical predictions.Comment: 11 pages, 3 figures, submittedto Phys. Rev. Let

Entangled-Photon Imaging of a Pure Phase Object