@MISC{Song03quantumkey, author = {Daegene Song}, title = {Quantum Key Distribution using Entanglement Swapping}, year = {2003} }

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Abstract

We propose quantum key distribution schemes based on entanglement swapping. Using two Bell states, two bits of secret key between two distant parties can be shared. Cryptography has been one of the most fruitful applications coming out of quantum information theory and it appears to be practically implementible in the nearest future among quantum technology [1]. A number of cryptographic key distribution protocols based on quantum mechanics have been proposed. Bennett and Brassard [2] were the first to propose a quantum based key distribution (called BB84) using four quantum states. In 1991, Ekert showed [3] that quantum entanglement can be useful in sharing private keys between the two parties. Suppose Alice and Bob share many maximally entangled pairs of qubits. They then make measurements in jointly determined random bases. After the measurements, Alice and Bob publicly announce which basis they have used. If they had measured in the same basis, the keys would be perfectly correlated. Instead of discarding the keys resulting from measuring in different bases, Alice and