Dark states ultra-long fiber laser for practically secure key distribution

Omer Kotlicki, Jacob Scheuer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present and demonstrate a novel ultra-long fiber laser key distribution system (UFL-KDS). The scheme quenches the lasing process when in its secure states, thus forming “dark states” which provide simple detection on one hand and increased difficulty of eavesdropping on the other. We analyze the practical aspects of previously studied UFL-KDS schemes as well as those of the one presented here and demonstrate successful key distribution across a 200 km link with bit-rates that can exceed 0.5 kbps. Spectral and temporal passive attack strategies are analyzed and discussed in details.

Original languageEnglish
Pages (from-to)2293-2311
Number of pages19
JournalQuantum Information Processing
Issue number10
StatePublished - 1 Oct 2014


  • Fiber laser
  • Laser dynamics
  • Raman
  • Secure communications


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