Abstract

We propose a quantum key distribution based on Mach-Zehnder (MZ) interferometry and interaction-free measurement on single photon. The raw key comes from the photons on which MZ interferometry happened. And the interaction-free measurements are used to detect eavesdroppers. The analysis indicates that the protocol is secure, and can prevent some familiar attacks, such as photon number splitting (PNS) attack. This scheme is easy to be realized in current experiments.

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