Localized Closed Timelike Curves Can Perfectly Distinguish Quantum States
Todd A. Brun, Jim Harrington, Mark M. Wilde
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.
arXiv:0811.1209•Physical Review Letters•May 27, 2009•62 citations