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Unconditionally Secure Bit Commitment by Transmitting Measurement Outcomes
Adrian Kent
We propose a new unconditionally secure bit commitment scheme based on Minkowski causality and the properties of quantum information. The receiving party sends a number of randomly…
Too Damned Quiet?
Adrian Kent
It is often suggested that extraterrestial life sufficiently advanced to be capable of interstellar travel or communication must be rare, since otherwise we would have seen evidenc…
The Many Worlds of Hugh Everett III
Adrian Kent
A review of Peter Byrne's biography of Hugh Everett III, "The Many Worlds of Hugh Everett III: Multiple Universes, Mutual Assured Destruction, and the Meltdown of a Nuclear Family"…
Location-Oblivious Data Transfer with Flying Entangled Qudits
Adrian Kent
We present a simple and practical quantum protocol involving two mistrustful agencies in Minkowski space, which allows Alice to transfer data to Bob at a spacetime location that ne…
Unconditionally Secure Bit Commitment with Flying Qudits
Adrian Kent
In the task cryptographers call bit commitment, one party encrypts a prediction in a way that cannot be decrypted until they supply a key, but has only one valid key. Bit commitmen…
A No-summoning theorem in Relativistic Quantum Theory
Adrian Kent
Alice gives Bob an unknown localized physical state at some point P. At some point Q in the causal future of P, Alice will ask Bob for the state back. Bob knows this, but does not…