Multichannel parallel continuous-variable quantum key distribution with Gaussian modulation
Jian Fang,Peng Huang,Guihua Zeng +2 more
TL;DR: Results indicate that by using this subcarrier multiplexing technique, each channel will be introduced a non-Gaussian extra source noise, resulting slightly short of the maximum transmission distance, while the total secret key rate can be considerably increased.
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Abstract: We propose a scheme for continuous-variable quantum key distribution (CV-QKD) using the subcarrier multiplexing technique which was employed in microwave photonics. This scheme allows distribution of $N$ channels with independent Gaussian-modulated CV-QKD in parallel with one laser source and several phase modulators. We analyze the influence of nonlinear signal mixing and security in the asymptotic limit. Results indicate that by using this multiplexing technique, each channel will have a non-Gaussian extra source noise, resulting in slight shortening of the maximum transmission distance, while the total secret key rate can be considerably increased. This scheme could also be used for key distribution for multiple users, and combined with wavelength division multiplexing devices it has potential to be used for construction of a CV-QKD network.
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Figures
FIG. 1. (Color online) System layout of the multi-channel parallel CV-QKD scheme. The signal light is in red solid line and the local oscillator light is in red dashed line. 
FIG. 4. (Color online) The entanglement-based scheme of the kth channel. Fred is assumed to be a neutral party and Eve cannot benefit from neither Fred’s information nor the imperfections of Bob’s homodyne detector. 
FIG. 3. (Color online) Source noise to modulation variance ratio ǫS (k)/VA in terms of mk of the first channel(k=1) and the last channel(k=N). Curves from top to bottom represent (N, k)=(40, 1), (40, 40), (15, 1), (15, 15), (5, 1) and (5, 5), respectively.
Citations
Long-distance continuous-variable quantum key distribution by controlling excess noise
TL;DR: This work overcome the previous range limitation by controlling system excess noise and reports a long distance continuous-variable quantum key distribution experiment, paving the road to the large-scale secure quantum communication with continuous variables and serves as a stepping stone in the quest for quantum network.
Continuous-variable quantum key distribution with non-Gaussian operations
TL;DR: In this paper, the performance of continuous-variable quantum key distribution (CV-QKD) protocols with non-Gaussian operations is investigated, including photon subtraction and addition, and photon catalysis.
78
Performance analysis of the satellite-to-ground continuous-variable quantum key distribution with orthogonal frequency division multiplexed modulation
TL;DR: The results reveal that satellite-to-ground CVQKD system can reduce the atmosphere influence in an OFDM system and the secret key rate is improved with the OFDM technique within a certain range of subcarrier numbers.
34
Multicarrier Multiplexing Continuous-Variable Quantum Key Distribution at Terahertz Bands Under Indoor Environment and in Inter-Satellite Links Communication
TL;DR: In this paper, a continuous variable quantum key distribution (CVQKD) scheme at terahertz (THz) bands based on multicarrier multiplexing (MCM) technology is proposed.
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