Localized closed timelike curves can perfectly distinguish quantum states

Abstract

We show that qubits traveling along closed timelike curves are a resource that a party can exploit to distinguish perfectly any set of quantum states. As a result, an adversary with access to closed timelike curves can break any prepare-and-measure quantum key distribution protocol. Our result also implies that a party with access to closed timelike curves can violate the Holevo bound.

4.1 pages, 2 figures; v2: revised title, abstract, introduction and conclusion, plus added references

References in corpus (1)

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