Free-space continuous-variable Quantum Cryptography
Shingo Tokunaga, Kazuya Shirasaki, Takuya Hirano · 2007
Free-space quantum key distribution (QKD) is expected to realized a global system for QKD based on a network of ground to satellite or satellite to satellite, and thus to extend the distance limit and the utility of QKD method (Schmitt-Manderbach et al., 2007). We report an experimental demonstration of free-space continuous-variable QKD (CV-QKD). We use a 1.55 m-wavelength pulsed diode laser and a pulsed homodyne detector. We have demonstrated free-space CV-QKD using a novel collinear interferometer. Our result shows the feasibility of practical free-space CV-QKD. We believe it will be an important step for the future study of free-space CV-QKD.