DocumentCode :
1232568
Title :
Quantum Key Distribution Based on Private States: Unconditional Security Over Untrusted Channels With Zero Quantum Capacity
Author :
Horodecki, Karol ; Horodecki, Michal ; Horodecki, Pawel ; Leung, Debbie ; Oppenheim, Jonathan
Author_Institution :
Dept. of Math., Gdansk Univ., Gdansk
Volume :
54
Issue :
6
fYear :
2008
fDate :
6/1/2008 12:00:00 AM
Firstpage :
2604
Lastpage :
2620
Abstract :
In this paper, we prove unconditional security for a quantum key distribution (QKD) protocol based on distilling pbits (twisted ebits) from an arbitrary untrusted state that is claimed to contain distillable key. Our main result is that we can verify security using only public communication-via parameter estimation of the given untrusted state. The technique applies even to bound-entangled states, thus extending QKD to the regime where the available quantum channel has zero quantum capacity. We also show how to convert our purification-based QKD schemes to prepare/measure schemes.
Keywords :
channel capacity; cryptographic protocols; parameter estimation; quantum cryptography; quantum entanglement; telecommunication security; bound-entangled state; parameter estimation; quantum key distribution protocol; unconditional security; untrusted quantum channel; zero quantum capacity; Error analysis; Mathematics; Paramagnetic resonance; Parameter estimation; Phase estimation; Physics; Protocols; Quantum computing; Quantum entanglement; Security; Quantum key distribution (QKD);
fLanguage :
English
Journal_Title :
Information Theory, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9448
Type :
jour
DOI :
10.1109/TIT.2008.921870
Filename :
4529275
Link To Document :
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