We have measured the phase structure of a glass wedge with single photons and biphotons in a Mach–Zehnder interferometer using parametric downconverted light from a Hong–Ou–Mandel particle interferometer as the source. By scanning the wedge through the focus of a microscope objective we find a doubling of the period of the interference pattern in the coincidence counts for biphotons compared to the single-photon experiment. We compare our measurement setup with classical ones and discuss some of the problems of superresolution in quantum lithography.
© 2007 Optical Society of America
Original Manuscript: February 6, 2007
Revised Manuscript: June 15, 2007
Manuscript Accepted: June 17, 2007
Published: July 27, 2007
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics
K. Schmid, H. Becker, W. Dultz, W. Martienssen, M. Kempe, and H. Schmitzer, "Interferometric optical path measurement of a glass wedge with single photons and biphotons," Opt. Lett. 32, 2257-2259 (2007)