期刊
PHYSICAL REVIEW A
卷 96, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.96.012301
关键词
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资金
- EU FP7 [308803, BRISQ2]
- MSMTCR [7E13032]
- Czech Science Foundation [13-27533J, GB14-36681G]
- Development Project of Faculty of Science, Palacky University
Quantum key distribution can be enhanced and extended if nonclassical single-photon states of light are used. We study a connection between the security of quantum key distribution and quantum non-Gaussianity of light arriving at the receiver's detection system after the propagation through a noisy quantum channel, being under full control of an eavesdropper performing general collective attacks. We show that while quantum nonclassicality exhibited by the light arriving at the receiver's station is a necessary indication of the security of the discrete-variable protocols,quantum non-Gaussianity can be a sufficient indication of their security. Therefore, checking for non-Gaussianity of this light by performing standard autocorrelation function measurement can be used for prior verification of the usability of prepare-and-measure schemes. It can play a similar role to the prior verification of the quantum correlations sufficient to violate Bell inequalities for entanglement-based protocols.
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