Secure Key Distribution by Swapping Quantum Entanglement

Abstract

We report two key distribution schemes achieved by swapping quantum entanglement. Using two Bell states, two bits of secret key can be shared between two distant parties that play symmetric and equal roles. We also address eavesdropping attacks against the schemes.

4 pages, 2 figures, 3 tables. The revised version will appear in Phys. Rev. A

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• Many-agent controlled teleportation of multi-qubit quantum information
• Quantum key distribution without alternative measurements and rotations
• Improved Wójcik's Eavesdropping Attack on Ping-Pong Protocol Without Eavesdropping-Induced Channel Loss
• Quantum secure conditional direct communication via EPR pairs
• A Quantum Cryptographic Protocol with Detection of Compromised Server