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Small-form-factor Gaussian-modulated coherent-state transmitter for CV-QKD using a gain-switched DFB laser.
Optics Express
|February 24, 2023
Summary
We developed a simplified quantum transmitter for secure key distribution. This compact, robust laser system achieves a secret key rate of 2.63 Mbps over 11 km, ideal for metropolitan networks.
Area of Science:
- Quantum Information Science
- Optical Communications
- Laser Physics
Background:
- Continuous-variable quantum key distribution (CV-QKD) protocols require specific quantum states.
- Existing Gaussian-modulated coherent-state (GMCS) CV-QKD systems often rely on complex setups with external modulators.
Purpose of the Study:
- To design and demonstrate a simplified quantum transmitter for GMCS CV-QKD.
- To reduce the complexity and enhance the practicality of CV-QKD systems.
Main Methods:
- Utilized a directly modulated distributed feedback laser operating in gain-switching mode.
- Integrated laser modulation and state preparation into a single component.
Main Results:
- Successfully generated the necessary coherent states for GMCS CV-QKD.
- Achieved a potential asymptotic secret key rate of 2.63 Mbps.
- Demonstrated performance over an 11-km fiber link.
Conclusions:
- The directly modulated GMCS transmitter offers a compact and robust solution for CV-QKD.
- This technology is well-suited for deployment in metropolitan optical networks due to its simplified design and cost-effectiveness.
