A scheme for demonstration of four-photon de Broglie wavelength

摘要

We propose a scheme to effectively generate a four-photon path-entangled number state[the NOON state i.e.1/√2(|N,0>+|0,N>)]for the demonstration of four-photon de Broglie wavelength.Our scheme requires only linear optical elements,photon detectors and post-selections which are all within the reach of current technology.