Physics – Quantum Physics
Scientific paper
2009-08-04
New Journal of Physics, 11(10): 103037 (2009)
Physics
Quantum Physics
13 pages. Expanded main proofs with more detail, miscellaneous edits for clarity
Scientific paper
10.1088/1367-2630/11/10/103037
Device independent quantum key distribution aims to provide a higher degree of security than traditional QKD schemes by reducing the number of assumptions that need to be made about the physical devices used. The previous proof of security by Pironio et al. applies only to collective attacks where the state is identical and independent and the measurement devices operate identically for each trial in the protocol. We extend this result to a more general class of attacks where the state is arbitrary and the measurement devices have no memory. We accomplish this by a reduction of arbitrary adversary strategies to qubit strategies and a proof of security for qubit strategies based on the previous proof by Pironio et al. and techniques adapted from Renner.
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