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Published on: June 8, 2018
Experimental demonstration of subcarrier multiplexed quantum key distribution system
José Mora1, Antonio Ruiz-Alba, Waldimar Amaya
1ITEAM Research Institute, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
Optics Letters
|June 5, 2012
Summary
This study demonstrates sending multiple secure quantum keys using subcarrier multiplexing (SCM). This technique offers high spectral efficiency and simplifies quantum key distribution systems.
Area of Science:
- Quantum Information Science
- Optical Communications
- Microwave Photonics
Background:
- Subcarrier multiplexing (SCM) is a technique widely used in microwave photonics.
- Current quantum key distribution (QKD) systems face challenges in spectral efficiency and system complexity.
- Parallel key distribution is crucial for enhancing the performance of QKD.
Purpose of the Study:
- To experimentally demonstrate the feasibility of sending multiple parallel quantum keys using SCM.
- To evaluate the performance of SCM in terms of spectral efficiency and key rates.
- To explore the potential for upgrading SCM-based QKD systems.
Main Methods:
- Implementation of a quantum key distribution system utilizing SCM.
- Multiplexing of several quantum channels over a shared optical path.
- Experimental setup to measure key rates and quantum bit error rates.
Main Results:
- Successful experimental demonstration of parallel key transmission using SCM.
- Achieved a sifted key rate of 10 Kb/s per channel.
- Maintained a quantum bit error rate below 2% over the optical link.
Conclusions:
- SCM is a feasible technique for parallel quantum key distribution.
- The SCM approach offers high spectral efficiency and reduced system complexity.
- Potential for future upgrades using wavelength division multiplexing for increased key capacity.
