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The physics of ghost imaging

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Abstract

One of the most surprising consequences of quantum mechanics is the nonlocal behavior of a multi-particle system. Although questions regarding fundamental issues of quantum theory still exist, nonclassical surprises have started to play important roles in practical applications. Ghost imaging is one of these exciting areas. Two types of ghost imaging have been experimentally demonstrated since 1995. Type-one ghost imaging uses entangled photon pairs and type-two ghost imaging uses chaotic light. The unique point-to-point image-forming correlation between the object and image planes in ghost imaging is the result of a constructive-destructive interference which involves the nonlocal superposition of two-photon amplitudes, a nonclassical entity corresponding to different yet indistinguishable alternative ways of triggering a joint-detection event. This talk will explore and analyze the quantum nature of ghost imaging. It is true that classical challenges have never stopped. Quantum? Classical? A hot debate is currently focused on ghost imaging. This talk will defend the quantum mechanical point of view.

© 2008 Optical Society of America

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