40 km fiber transmission of squeezed light measured with a real local oscillator

I. Suleiman*, J. A.H. Nielsen, X. Guo, N. Jain, J. Neergaard-Nielsen, T. Gehring, U. L. Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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We demonstrate the generation, 40 km fiber transmission, and homodyne detection of single-mode squeezed states of light at 1550 nm using real-time phase control of a locally generated local oscillator (LO), often called a 'real LO' or 'local LO'. The system was able to stably measure up to around 3.7 dB of noise suppression with a phase noise uncertainty of around 2.5°, using only standard telecom-compatible components and a field-programmable gate array. The compactness, low degree of complexity and efficacy of the implemented scheme makes it a relevant candidate for long distance quantum communication in future photonic quantum networks.

Original languageEnglish
Article number045003
JournalQuantum Science and Technology
Issue number4
Number of pages10
Publication statusPublished - 2022


  • Homodyne detection
  • Local local oscillator
  • Photonic
  • Quantum information
  • Quantum key distribution
  • Real local oscillator
  • Squeezed


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