Localized closed timelike curves can perfectly distinguish quantum states

Details Localized closed timelike curves can perfectly distinguish quantum states Localized closed timelike curves can perfectly distinguish quantum states

2008-11-07

arxiv.org/abs/0811.1209v2

Physical Review Letters 102, 210402 (2009)

Physics

Quantum Physics

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

Scientific paper

10.1103/PhysRevLett.102.210402

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.

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