Robert W. Boyd
The field of quantum imaging strives to obtain images that are “better” than those obtained by conventional methods. These images are better in terms of properties such as their spatial resolution, their signal-to-noise ratio, and their ability to operate under harsh environments, such as the presence of a scattering medium between the object and the observer. In this talk I will describe some of the successes of research performed in this area. I will pay special attention to the process of ghost imaging. Some implementations of ghost imaging make use of the quantum methods, whereas other use entirely classical methods. Both methods make use of two highly correlated light waves. One of these waves interacts with the object to be imaged, and if it is not absorbed by the object it is detected by a detection system with broad angular acceptance, that is, is detected by a bucket detector. The other wave falls onto a camera with good spatial resolution. By correlating the signals from the two detectors, an image of the object is built up. In this talk I will first describe in more detail how the process of ghost imaging operates and will then provide a critique of when ghost imaging is useful and when it is not.