Crosstalk Impact on Continuous Variable Quantum Key Distribution in Multicore Fiber Transmission

Tobias A. Eriksson, Benjamin J. Puttnam, Georg Rademacher, Ruben S. Luis, Mikio Fujiwara, Masahiro Takeoka, Yoshinari Awaji, Masahide Sasaki, Naoya Wada

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We investigate the excess noise induced by crosstalk in a trench-assisted homogeneous 19-core fiber for a continuous variable quantum key distribution (CV-QKD) receiver. Crosstalk is studied for both 30 wavelength division multiplexing channels of 24.5-Gbaud PM-16QAM with 100-GHz channel spacing and for an amplified spontaneous emission signal with 37.5-GHz bandwidth. We show that in-band crosstalk from neighboring cores prohibits secret key generation. However, it is possible to place CV-QKD channels at wavelengths not used by the classical channels even though wideband amplified spontaneous emission noise is present. The excess noise induced by crosstalk from a neighboring core is shown to be time-dependent.

Original languageEnglish
Article number8638801
Pages (from-to)467-470
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number6
Publication statusPublished - 2019 Mar 15
Externally publishedYes


  • Quantum key distribution
  • crosstalk
  • multicore fibers
  • spatial division multiplexing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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