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Frontiers in Optics

Experimental demonstration of quantum spatial superresolution by optical centroid measurements

Heedeuk Shin, Kam Wai Clifford Chan, Hye Jeong Chang, Robert W. Boyd

Published Jan 1, 2010• 0 citations
Publisher

Abstract

We demonstrate experimentally quantum spatial superresolution with two-photon N00N state by measuring the centroid positions of the entangled photons. The optical centroid measurement shows higher detection efficiency than the conventional scheme based on multi-photon absorption.
DOI
10.1364/fio.2010.fmm2

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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 multiphoton 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 multiphoton detection and show that the new method leads to superresolution but with higher detection efficiency.