Analysis of quantum network coding for realistic repeater networks

Takahiko Satoh, Kaori Ishizaki, Shota Nagayama, Rodney Van Meter

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


Quantum repeater networks have attracted attention for the implementation of long-distance and large-scale sharing of quantum states. Recently, researchers extended classical network coding, which is a technique for throughput enhancement, into quantum information. The utility of quantum network coding (QNC) has been shown under ideal conditions, but it has not been studied previously under conditions of noise and shortage of quantum resources. We analyzed QNC on a butterfly network, which can create end-to-end Bell pairs at twice the rate of the standard quantum network repeater approach. The joint fidelity of creating two Bell pairs has a small penalty for QNC relative to entanglement swapping. It will thus be useful when we care more about throughput than fidelity. We found that the output fidelity drops below 0.5 when the initial Bell pairs have fidelity F<0.90, even with perfect local gates. Local gate errors have a larger impact on quantum network coding than on entanglement swapping.

Original languageEnglish
Article number032302
JournalPhysical Review A
Issue number3
Publication statusPublished - 2016 Mar 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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