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We describe the experimental test of a quantum key distribution performed with a two-way protocol without using entanglement. An individual incoherent eavesdropping is simulated and induces a variable amount of noise on the communication channel. This allows a direct verification of the agreement between theory and practice.doi:10.1103/physrevlett.96.200501 pmid:16803160 fatcat:3frpznilvfbqjcvegjj2wno52m