Experimental realization of a photonic Bell-state analyzer

Author(s): P. Walther, A. Zeilinger

Journal: Phys. Rev. A

Volume: 72

Page(s): 010302(R)

Year: 2005

DOI Number: 10.1103/PhysRevA.72.010302

Link: Link to publication


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.

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