Physics:Quantum BB84
BB84 is a Book I topic in the Quantum Collection. It is a quantum key distribution protocol proposed by Charles Bennett and Gilles Brassard in 1984. The protocol uses nonorthogonal quantum states, often photon polarizations, to let two parties establish a shared secret key while detecting possible eavesdropping. Its security comes from the fact that unknown quantum states cannot be measured without disturbance when the measurement basis is not known. BB84 connects the uncertainty principle, no-cloning, measurement, authentication, and classical error correction in one of the central examples of quantum cryptography.
Overview
Placeholder: explain how Alice and Bob use non-orthogonal polarization or spin bases to establish a shared secret key and detect eavesdropping.
Key ideas
Placeholder: cover basis choice, quantum measurement disturbance, sifted keys, error checking, privacy amplification.
Protocol idea
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Quantum states and bases
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Eavesdropping and error rates
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Security role in quantum information
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See also
Table of contents (217 articles)
Index
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References
Source attribution: Physics:Quantum BB84
