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Updated: Jun 10, 2025
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Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
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Continuous-variable quantum passive optical network
Adnan A E Hajomer1, Ivan Derkach2,3, Radim Filip4
1Center for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800, Kongens Lyngby, Denmark. aaeha@dtu.dk.
Light, Science & Applications
|October 15, 2024
Summary
We developed a scalable quantum passive optical network (QPON) protocol for high-rate, simultaneous secret key generation among multiple users. This continuous-variable approach advances secure quantum networking towards a quantum internet.
Area of Science:
- Quantum Information Science
- Quantum Communication Networks
- Cybersecurity
Background:
- Advancing quantum key distribution (QKD) from point-to-point to multi-user systems is crucial for scalable quantum networks.
- Maximizing network capacity requires inherently multi-user protocols.
Purpose of the Study:
- To propose and experimentally demonstrate a scalable, multi-user quantum passive optical network (QPON) protocol.
- To enable deterministic, simultaneous, and high-rate secret key generation in a quantum access network.
Main Methods:
- Utilized continuous-variable (CV) quantum systems, specifically the quadrature of coherent states.
- Implemented two QPON protocols with varying user trust levels.
- Experimentally demonstrated key generation in an 8-user network with 11 km fiber links.
Main Results:
- Achieved total network key generation rates of 1.5 and 2.1 Mbits/s (or 0.4 and 1.0 Mbits/s with finite-size channel estimation), depending on trust assumptions.
- Demonstrated simultaneous key generation across all network users.
- Showcased scalability for tens of users at high rates.
Conclusions:
- The proposed CV-QPON protocols offer a viable path towards low-cost, high-rate, and scalable secure quantum access networks.
- This work represents a significant step towards building a functional quantum internet.
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