Definition ∞ Quantum witness extraction refers to the process in quantum cryptography where a verifier can, from a valid quantum proof, extract the underlying quantum information (the “witness”) that the prover claims to possess. This capability is a fundamental property of certain quantum proof systems, allowing for the reconstruction of the secret data if the proof is correctly formed. It is a quantum analogue to classical witness extraction in computational complexity theory. This mechanism helps ensure the honesty of provers in quantum protocols.
Context ∞ News in quantum computing and cryptography discusses quantum witness extraction in the context of designing secure and verifiable quantum protocols. The ability to extract a witness is important for certain security proofs and for understanding the properties of quantum interactive proof systems. Research in this area contributes to the theoretical foundations of post-quantum blockchain security.
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