This article reports an experimental study on two-color ghost imaging with enhanced resolving power either by means of greater field of view or by means of greater imaging amplification compared with that of classical imaging.
Two-photon quantum imaging has so far demonstrated two peculiar features: (1) reproducing nonlocal images in "ghost" imaging type experiments and (2) improving imaging spatial resolution beyond the classical limit in quantum lithography type measurements. This article reports an experimental study on non-degenerate, two-color, biphoton ghost imaging which reproduced a nonlocal ghost image and simultaneously enhanced the angular resolving power of imaging by means of a greater field of view or by means of a greater imaging amplification compared with that of classical imaging.
Ghost imaging has been a subject of interest to the quantum optics community for the past 20 years. Initially seen as manifestation of quantum spookiness, it is now recognized as being implementable in both single- and many-photon number regimes. Beyond its scientific curiosity, it is now feeding novel imaging modalities potentially offering performance attributes that traditional approaches cannot match.This article is part of the themed issue 'Quantum technology for the 21st century'.
This article reports an experimental demonstration on nondegenerate, two-color, biphoton ghost imaging which reproduced a ghost image with enhanced angular resolving power by means of a greater field of view compared with that of classical imaging. With the same imaging magnification, the enhanced angular resolving power and field of view compared with those of classical imaging are 1.25:1 and 1.16:1, respectively. The enhancement of angular resolving power depends on the ratio between the idler and the signal photon frequencies, and the enhancement of the field of view depends mainly on the same ratio and also on the distances of the object plane and the imaging lens from the two-photon source. This article also reports the possibility of reproducing a ghost image with the enhancement of the angular resolving power by means of a greater imaging amplification compared with that of classical imaging.