The network impact of hijacking a quantum repeater

Takahiko Satoh, Shota Nagayama, Takafumi Oka, Rodney Van Meter

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


In quantum networking, repeater hijacking menaces the security and utility of quantum applications. To deal with this problem, it is important to take a measure of the impact of quantum repeater hijacking. First, we quantify the work of each quantum repeater with regards to each quantum communication. Based on this, we show the costs for repeater hijacking detection using distributed quantum state tomography and the amount of work loss and rerouting penalties caused by hijacking. This quantitative evaluation covers both purification-entanglement swapping and quantum error correction repeater networks. Naive implementation of the checks necessary for correct network operation can be subverted by a single hijacker to bring down an entire network. Fortunately, the simple fix of randomly assigned testing can prevent such an attack.

Original languageEnglish
Article number034008
JournalQuantum Science and Technology
Issue number3
Publication statusPublished - 2018 May 25


  • quantum network
  • quantum repeater
  • route hijacking

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering


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