Efficient teleportation is a crucial step for quantum computation and quantum networking. In the case of qubits, four different entangled Bell states have to be distinguished. We have realized a probabilistic, but in principle deterministic, Bell-state analyzer for two photonic quantum bits by the use of a nondestructive controlled-NOT gate based on entirely linear optical elements. This gate was capable of distinguishing between all of the Bell states with higher than 75% fidelity without any noise substraction due to utilizing quantum interference effects.
@article{arxiv.quant-ph/0410244,
title = {Experimental Realization of a Photonic Bell-State Analyzer},
author = {Philip Walther and Anton Zeilinger},
journal= {arXiv preprint arXiv:quant-ph/0410244},
year = {2009}
}