Using spontaneous parametric down conversion and a 50:50 beam splitter, we generate coaxial polarization-entangled photon pairs, of which the two photons are far separated from each other. The photons are then sent one by one through one port of a modified Mach-Zehnder interferometer. We observe interference fringes with a periodicity half of the single-photon wavelength, independent of the distance between the photons. This feature can find applications in quantum-enhanced measurement.
@article{arxiv.1005.0802,
title = {Interference of overlap-free entangled photons with a Mach-Zehnder-like interferometer},
author = {Xian-Min Jin and Cheng-Zhi Peng and Tao Yang and Youjin Deng},
journal= {arXiv preprint arXiv:1005.0802},
year = {2010}
}
Comments
8 pages, 3 figures, Submitted to New Journal of Physics (under review)