Splitting of quantum information in travelling wave fields using only linear optical elements
Wesley Bueno Cardoso, N. G. de Almeida, Ardiley Torres Avelar, B. Baseia · Journal of Physics B Atomic Molecular and Optical Physics · 2011
In this paper we present a feasible post-selection scheme to split quantum information in the realm of travelling waves with success probability of 50%. Taking advantage of this scheme we have also proposed the generation of a class of W states useful for perfect teleportation and superdense coding. The scheme employs only linear optical elements as beam splitters (BS) and phase shifters, plus two photon counters and a source of two spontaneous parametric down-conversion photons. It is shown that splitting of quantum information with high fidelity is possible, even when using inefficient detectors and photoabsorption BS.