Squeezed states continuous-variable quantum key distribution over 40 km fibre with “local” local oscillator

Huy Q. Nguyen; Ivan Derkach; Hou Man Chin; Adnan A.E. Hajomer; Nitin Jain; Ulrik L. Andersen; Vladyslav C. Usenko; Tobias Gehring

doi:10.1109/CLEO/EUROPE-EQEC65582.2025.11110970

Abstract

Squeezed states promise significant enhancements to continuous-variable quantum key distribution (CV-QKD) systems; however, experimental demonstrations with real fibre channels remain elusive due to practical implementation challenges. Here, we propose and experimentally demonstrate a prepare-and-measure CV-QKD protocol utilising displaced squeezed states. We implemented this protocol over 40 km of single mode fibre with a free-running local local oscillator (LLO). Digital signal processing (DSP) was used for frequency and phase synchronization [1].

Original language	English
Publication date	2025
Number of pages	1
DOIs	https://doi.org/10.1109/CLEO/EUROPE-EQEC65582.2025.11110970
Publication status	Published - 2025
Event	2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference - ICM – International Congress Center of Messe München, Munich, Germany Duration: 23 Jun 2025 → 27 Jun 2025 https://www.cleoeurope.org/

Conference

Conference	2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference
Location	ICM – International Congress Center of Messe München
Country/Territory	Germany
City	Munich
Period	23/06/2025 → 27/06/2025
Internet address	https://www.cleoeurope.org/

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10.1109/CLEO/EUROPE-EQEC65582.2025.11110970

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Nguyen, H. Q., Derkach, I., Chin, H. M., Hajomer, A. A. E., Jain, N., Andersen, U. L., Usenko, V. C., & Gehring, T. (2025). Squeezed states continuous-variable quantum key distribution over 40 km fibre with “local” local oscillator. Abstract from 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, Munich, Germany. https://doi.org/10.1109/CLEO/EUROPE-EQEC65582.2025.11110970

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abstract = "Squeezed states promise significant enhancements to continuous-variable quantum key distribution (CV-QKD) systems; however, experimental demonstrations with real fibre channels remain elusive due to practical implementation challenges. Here, we propose and experimentally demonstrate a prepare-and-measure CV-QKD protocol utilising displaced squeezed states. We implemented this protocol over 40 km of single mode fibre with a free-running local local oscillator (LLO). Digital signal processing (DSP) was used for frequency and phase synchronization [1].",

author = "Nguyen, \{Huy Q.\} and Ivan Derkach and Chin, \{Hou Man\} and Hajomer, \{Adnan A.E.\} and Nitin Jain and Andersen, \{Ulrik L.\} and Usenko, \{Vladyslav C.\} and Tobias Gehring",

note = "Publisher Copyright: {\textcopyright} 2025 IEEE.; 2025 Conference on Lasers and Electro-Optics Europe \& European Quantum Electronics Conference, CLEO/Europe-EQEC 2025 ; Conference date: 23-06-2025 Through 27-06-2025",

year = "2025",

doi = "10.1109/CLEO/EUROPE-EQEC65582.2025.11110970",

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Nguyen, HQ, Derkach, I, Chin, HM , Hajomer, AAE , Jain, N , Andersen, UL, Usenko, VC & Gehring, T 2025, 'Squeezed states continuous-variable quantum key distribution over 40 km fibre with “local” local oscillator', 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, Munich, Germany, 23/06/2025 - 27/06/2025. https://doi.org/10.1109/CLEO/EUROPE-EQEC65582.2025.11110970

Squeezed states continuous-variable quantum key distribution over 40 km fibre with “local” local oscillator. / Nguyen, Huy Q.; Derkach, Ivan; Chin, Hou Man et al.
2025. Abstract from 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, Munich, Germany.

Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

TY - ABST

T1 - Squeezed states continuous-variable quantum key distribution over 40 km fibre with “local” local oscillator

AU - Nguyen, Huy Q.

AU - Derkach, Ivan

AU - Chin, Hou Man

AU - Hajomer, Adnan A.E.

AU - Jain, Nitin

AU - Andersen, Ulrik L.

AU - Usenko, Vladyslav C.

AU - Gehring, Tobias

PY - 2025

Y1 - 2025

N2 - Squeezed states promise significant enhancements to continuous-variable quantum key distribution (CV-QKD) systems; however, experimental demonstrations with real fibre channels remain elusive due to practical implementation challenges. Here, we propose and experimentally demonstrate a prepare-and-measure CV-QKD protocol utilising displaced squeezed states. We implemented this protocol over 40 km of single mode fibre with a free-running local local oscillator (LLO). Digital signal processing (DSP) was used for frequency and phase synchronization [1].

AB - Squeezed states promise significant enhancements to continuous-variable quantum key distribution (CV-QKD) systems; however, experimental demonstrations with real fibre channels remain elusive due to practical implementation challenges. Here, we propose and experimentally demonstrate a prepare-and-measure CV-QKD protocol utilising displaced squeezed states. We implemented this protocol over 40 km of single mode fibre with a free-running local local oscillator (LLO). Digital signal processing (DSP) was used for frequency and phase synchronization [1].

U2 - 10.1109/CLEO/EUROPE-EQEC65582.2025.11110970

DO - 10.1109/CLEO/EUROPE-EQEC65582.2025.11110970

M3 - Conference abstract for conference

AN - SCOPUS:105016266932

T2 - 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference

Y2 - 23 June 2025 through 27 June 2025