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The two peculiar features of quantum imaging:(1) reproduction of nonlocal "ghost" images and (2) improvement of imaging spatial resolution beyond the classical limit were demonstrated so far in "ghost" imaging experiments and lithography types of measurements respectively. This article reports an experimental study on two-color ghost imaging with enhanced angular resolving power by means of greater field of view compared with that of classical imaging. An approach to resolve the problem of enhancing the angular resolution in space imaging by using entangled photon pairs of two colors is also reported in this article. These reported features of ghost imaging are very important and useful in the area of sensing as well as imaging applications.

Although the abstract rules of quantum mechanics and quantum field theory seem to be able to describe the results of quantum optics experiments, it would be highly desirable to comprehend what is actually "going on" in terms of a physical picture of quantum phenomena. Actual experimental realizations in a single manner of correlation of the Einstein-Podolsky-Rosen-Bohm type predicted for entabgled two-photon states can focus attention on this "conceptual incompleteness" of quantum mechanics.