Secret key rate of a continuous-variable quantum-key-distribution scheme when the detection process is inaccessible to eavesdroppers
| Autor: | Takuya Hirano, Akira Kitagawa, Ryo Namiki |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Quantum Physics Gaussian FOS: Physical sciences Quantum key distribution Interference (wave propagation) 01 natural sciences Noise (electronics) 010309 optics symbols.namesake Transmission (telecommunications) Postselection 0103 physical sciences Key (cryptography) symbols Coherent states 010306 general physics Quantum Physics (quant-ph) Algorithm Computer Science::Cryptography and Security Computer Science::Information Theory |
| Popis: | We have developed a method to calculate a secret key rate of a continuous-variable quantum-key-distribution scheme using four coherent states and postselection for a general model of Gaussian attacks. We assume that the transmission line and detection process are described by a pair of Gaussian channels. In our analysis, while the loss and noise on the transmission line are induced by an eavesdropper, Eve, who can replace the transmission line with a lossless and noiseless optical fiber, she is assumed inaccessible to the detection process. By separating the transmission noise and detection noise, we can always extract a larger key compared with the case that all loss and noises are induced by an eavesdropper's interference. An asymptotic key rate against collective Gaussian attacks can be determined numerically for the given channels' parameters. The improvement of the key rates turns out to be more significant for the reverse-reconciliation scheme. 9 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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