Super-resolving phase measurements with a multi-photon entangled state
arXiv:quant-ph/0312186 · doi:10.1038/nature02493
Abstract
Using a linear optical elements and post-selection, we construct an entangled polarization state of three photons in the same spatial mode. This state is analogous to a ``photon-number path entangled state'' and can be used for super-resolving interferometry. Measuring a birefringent phase shift, we demonstrate two- and three-fold improvements in phase resolution.
4 pages, 3 figures