Quantum lithography (QL) has been suggested as a means of achieving enhanced
spatial resolution for optical imaging, but its realization has been held back
by the low multi-photon detection rates of recording materials. Recently, an
optical centroid measurement (OCM) procedure was proposed as a way to obtain
spatial resolution enhancement identical to that of QL but with higher
detection efficiency (M. Tsang, Phys. Rev. Lett. 102, 253601, 2009). Here we
describe a variation of the OCM method with still higher detection efficiency
based on the use of photon-number-resolving detection. We also report
laboratory results for two-photon interference. We compare these results with
those of the standard QL method based on multi-photon detection and show that
the new method leads to superresolution but with higher detection efficiency.Comment: 4 pages, 2 figure
