Continuous-variable quantum passive optical network

Adnan A. E. Hajomer; Ivan Derkach; Radim Filip; Ulrik L. Andersen; Vladyslav C. Usenko; Tobias Gehring

doi:10.1038/s41377-024-01633-9

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Continuous-variable quantum passive optical network

Original Articles

- Continuous-variable quantum passive optical network
- Light: Science & Applications Vol. 13, Issue 12, Pages: 3099-3108(2024)
- Affiliations：
  
  1.Center for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800, Kongens Lyngby, Denmark
  2.Department of Optics, Faculty of Science, Palacky University, 17. listopadu 12, 771 46, Olomouc, Czech Republic
- Author bio：
  
  Adnan A. E. Hajomer (aaeha@dtu.dk)
  Ivan Derkach (ivan.derkach@upol.cz)
  Tobias Gehring (tobias.gehring@fysik.dtu.dk)
- Funds：
- DOI：10.1038/s41377-024-01633-9
  CLC：
- Received：29 May 2024，
  
  Revised：06 September 2024，
  
  Accepted：2024-09-10，
  
  Published Online：16 October 2024，
  
  Published：31 December 2024
- Accepted：
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Hajomer, A. A. E. et al. Continuous-variable quantum passive optical network. Light: Science & Applications, 13, 3099-3108 (2024).
DOI：

Hajomer, A. A. E. et al. Continuous-variable quantum passive optical network. Light: Science & Applications, 13, 3099-3108 (2024). DOI： 10.1038/s41377-024-01633-9.

摘要

Abstract

To establish a scalable and secure quantum network

a critical milestone is advancing from basic point-to-point quantum key distribution (QKD) systems to the development of inherently multi-user protocols designed to maximize network capacity. Here

we propose a quantum passive optical network (QPON) protocol based on continuous-variable (CV) systems

particularly the quadrature of the coherent state

which enables deterministic

simultaneous

and high-rate secret key generation among all network users. We implement two protocols with different trust levels assigned to the network users and experimentally demonstrate key generation in a quantum access network with 8 users

each with an 11 km span of access link. Depending on the trust assumptions about the users

we reach 1.5 and 2.1 Mbits/s of total network key generation (or 0.4 and 1.0 Mbits/s with finite-size channels estimation). Demonstrating the potential to expand the network’s capacity to accommodate tens of users at a high rate

our CV-QPON protocols open up new possibilities in establishing low-cost

high-rate

and scalable secure quantum access networks serving as a stepping stone towards a quantum internet.

关键词

Keywords

references

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