Simple proof of security of the BB84 quantum key distribution protocol |
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Authors: | Shor Preskill |
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Institution: | AT&T Labs Research, Florham Park, New Jersey 07932, USA. |
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Abstract: | We prove that the 1984 protocol of Bennett and Brassard (BB84) for quantum key distribution is secure. We first give a key distribution protocol based on entanglement purification, which can be proven secure using methods from Lo and Chau's proof of security for a similar protocol. We then show that the security of this protocol implies the security of BB84. The entanglement purification based protocol uses Calderbank-Shor-Steane codes, and properties of these codes are used to remove the use of quantum computation from the Lo-Chau protocol. |
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