Journal
PHYSICAL REVIEW A
Volume 92, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.92.062337
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Funding
- Czech Science Foundation [P205/10/P32]
- European Union FP7 Project [BRISQ2, 308803]
- MSMTCR [7E13032]
- NATO SPS Project [984397]
- French Agence Nationale de la Recherche FReQueNCy project [ANR-09-BLAN-0410-02]
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We propose the continuous-variable quantum key distribution protocol based on the Gaussian modulation of a single quadrature of the coherent states of light, which is aimed to provide simplified implementation compared to the symmetrically modulated Gaussian coherent-state protocols. The protocol waives the necessity in one of the quadrature modulations and the corresponding channel transmittance estimation. The security of the protocol against collective attacks in a generally phase-sensitive Gaussian channel is analyzed and is shown achievable upon certain conditions. Robustness of the protocol to channel imperfections is compared to that of the symmetrical coherent-state protocol. The simplified unidimensional protocol is shown possible at a reasonable quantitative cost in terms of key rate and of tolerable channel excess noise.
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