Two-Photon Path-Entangled States in Multimode Waveguides
Eilon Poem, Yehonatan Gilead, Yaron R. Silberberg · Physical Review Letters · 2012
We experimentally show that two-photon path-entangled states can be coherently manipulated by multimode interference in multimode waveguides. By measuring the output two-photon spatial correlation function versus the phase of the input state, we show that multimode waveguides perform as nearly ideal multiport beam splitters at the quantum level, creating a large variety of entangled and separable multipath two-photon states.