Related Experiment Video
Updated: Nov 27, 2025
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
14.8K
Improving the Maximum Transmission Distance of Self-Referenced Continuous-Variable Quantum Key Distribution Using a
Yijun Wang1, Xudong Wang1, Duan Huang1
1School of Information Science and Engineering, Central South University, Changsha 410083, China.
Entropy (Basel, Switzerland)
|December 3, 2020
Summary
A noiseless linear amplifier (NLA) can enhance self-referenced continuous variable quantum key distribution (CV-QKD) with weak reference pulses. This improves performance and extends transmission distance by compensating for phase noise.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Quantum Communication Systems
Background:
- Self-referenced continuous variable quantum key distribution (SR CV-QKD) performance is limited by weak reference pulses.
- Amplitude modulator imperfections restrict reference pulse amplitude in SR CV-QKD.
- Reference pulse amplitude directly impacts SR CV-QKD performance.
Purpose of the Study:
- To investigate the use of a noiseless linear amplifier (NLA) to improve SR CV-QKD performance.
- To address performance degradation caused by weak reference pulses in SR CV-QKD.
- To enhance the transmission distance of SR CV-QKD systems.
Main Methods:
- Implementing a noiseless linear amplifier (NLA) at the receiver end of the SR CV-QKD system.
- Analyzing the impact of NLA on phase noise compensation.
- Conducting simulations based on collective attack models.
Main Results:
- The NLA effectively compensates for significant phase noise introduced by weak reference pulses.
- Simulations demonstrate improved SR CV-QKD performance with weak reference pulses.
- The maximum transmission distance of SR CV-QKD is extended by using an NLA.
Conclusions:
- A properly placed NLA can significantly enhance SR CV-QKD performance with weak reference pulses.
- The NLA mitigates the detrimental effects of phase noise, extending secure communication distances.
- The gain 'g' of an NLA is equivalent to overcoming 20log10g dB of channel loss.
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