Long-distance practical quantum key distribution by entanglement swapping

Artur Scherer*, Barry C. Sanders, Wolfgang Tittel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


We develop a model for practical, entanglement-based long-distance quantum key distribution employing entanglement swapping as a key building block. Relying only on existing off-the-shelf technology, we show how to optimize resources so as to maximize secret key distribution rates. The tools comprise lossy transmission links, such as telecom optical fibers or free space, parametric down-conversion sources of entangled pho-ton pairs, and threshold detectors that are inefficient and have dark counts. Our analysis provides the optimal trade-off between detector efficiency and dark counts, which are usually competing, as well as the optimal source brightness that maximizes the secret key rate for specified distances (i.e. loss) between sender and receiver.

Original languageEnglish
Pages (from-to)3004-3018
Number of pages15
JournalOptics Express
Issue number4
Publication statusPublished - 14 Feb 2011
Externally publishedYes


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