Three-photon N00N states generated by photon subtraction from double photon pairs
Heonoh Kim, Hee Su Park, Sang-Kyung Choi · Optics Express · 2009
We describe an experimental demonstration of a novel three-photon N00N state generation scheme using a single source of photons based on spontaneous parametric down-conversion (SPDC). The three-photon entangled state is generated when a photon is subtracted from a double pair of photons and detected by a heralding counter. Interference fringes measured with an emulated three-photon detector reveal the three-photon de Broglie wavelength and exhibit visibility > 70% without background subtraction.