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Relativistic Quantum Cryptography: controlling Information by fundamental physics

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Quantum systems carry an intrinsically quantum form of information, which cannot be copied and allows much stronger control than classical information. Special relativity also allows the flow of information to be controlled through the no-superluminal signalling principle. Together these have led to the emerging science and technology of relativistic quantum cryptography. I describe some applications, including verifying the location of a prisoner, using quantum teleportation to fake anything, running a secure quantum casino, guaranteeing trust in untrustworthy cryptographic device builders, and using quantum theory to decline party invitations with guaranteed tact. I also describe the first relativistic quantum cryptographic experiment, carried out recently by a Geneva-Singapore-Cambridge collaboration.

This talk is part of the CMS Colloquia series.

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