dorsal/arxiv
View SchemaA practical limitation for continuous-variable quantum cryptography using coherent states
| Authors | Ryo Namiki, Takuya Hirano |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0403115 |
| URL | https://arxiv.org/abs/quant-ph/0403115 |
| DOI | 10.1103/PhysRevLett.92.117901 |
Abstract
In this letter, first, we investigate the security of a continuous-variable quantum cryptographic scheme with a postselection process against individual beam splitting attack. It is shown that the scheme can be secure in the presence of the transmission loss owing to the postselection. Second, we provide a loss limit for continuous-variable quantum cryptography using coherent states taking into account excess Gaussian noise on quadrature distribution. Since the excess noise is reduced by the loss mechanism, a realistic intercept-resend attack which makes a Gaussian mixture of coherent states gives a loss limit in the presence of any excess Gaussian noise.
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"abstract": "In this letter, first, we investigate the security of a continuous-variable\nquantum cryptographic scheme with a postselection process against individual\nbeam splitting attack. It is shown that the scheme can be secure in the\npresence of the transmission loss owing to the postselection. Second, we\nprovide a loss limit for continuous-variable quantum cryptography using\ncoherent states taking into account excess Gaussian noise on quadrature\ndistribution. Since the excess noise is reduced by the loss mechanism, a\nrealistic intercept-resend attack which makes a Gaussian mixture of coherent\nstates gives a loss limit in the presence of any excess Gaussian noise.",
"arxiv_id": "quant-ph/0403115",
"authors": [
"Ryo Namiki",
"Takuya Hirano"
],
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"quant-ph"
],
"doi": "10.1103/PhysRevLett.92.117901",
"title": "A practical limitation for continuous-variable quantum cryptography using coherent states",
"url": "https://arxiv.org/abs/quant-ph/0403115"
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