Experimental investigation of quantum key distribution over water channel
arXiv:1903.01171 · doi:10.1364/AO.58.003902
Abstract
Quantum key distribution (QKD) has undergone significant development in recent decades, particularly with respect to free-space (air) and optical fiber channels. Here, we report the first proof-of-principle experiment for the BB84 protocol QKD over a water channel. Firstly, we demonstrate again the polarization preservation properties of the water channel in optical transmission according to the measured Mueller matrix, which is close to the unit matrix. The reason for the polarization preservation, revealed by Monte Carlo simulation, is that almost all the received photons are unscattered.Then, we performed the first polarization encoding BB84 protocol QKD over a 2.37m water channel. The results show that QKD can be performed with a low quantum bit error rate (QBER), less than 3.5%, with different attenuation coefficients.
arXiv comment14 pages, 5 figures
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- Quantitative analysis of the blue-green single-photon emission from a quantum dot in a thick tapered nanowire
- Multi-Hop Quantum Key Distribution with Passive Relays over Underwater Turbulence Channels
- On the Optimization of Underwater Quantum Key Distribution Systems with Time-Gated SPADs
- Practical underwater quantum key distribution based on decoy-state BB84 protocol