  Correlated-photon imaging, popularly known as ghost imaging, is a technique
whereby an image is formed from light that has never interacted with the
object. In ghost imaging experiments two correlated light fields are produced.
One of these fields illuminates the object, and the other field is measured by
a spatially resolving detector. In the quantum regime, these correlated light
fields are produced by entangled photons created by spontaneous parametric
down-conversion. To date, all correlated-photon ghost-imaging experiments have
scanned a single-pixel detector through the field of view to obtain the spatial
information. However, scanning leads to a poor sampling efficiency, which
scales inversely with the number of pixels, N, in the image. In this work we
overcome this limitation by using a time-gated camera to record the
single-photon events across the full scene. We obtain high-contrast images,
90%, in either the image plane or the far-field of the photon pair source,
taking advantage of the EPR-like correlations in position and momentum of the
photon pairs. Our images contain a large number of modes, >500, creating
opportunities in low-light-level imaging and in quantum information processing.
