| Paper Abstract and Keywords |
| Presentation |
2020-12-10 10:10
Security of continuous variable quantum key distribution with digital signal processing
Takaya Matsuura, Kento Maeda, Toshihiko Sasaki, Masato Koashi (U-Tokyo) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
Continuous-variable (CV) quantum key distribution (QKD) uses homodyne/heterodyne measurement, which is technologically matured and widely used. Compared to a conventional discrete-variable (DV) QKD, it has lower implementation cost and affinity to wavelength division multiplexing. On the other hand, its continuous nature makes it harder to accommodate to practical signal processing, which is always discretized, and complete security proof has not been established so far in contrast to DV QKD protocols. Here, we propose a method of estimating fidelity of a measured pulse to a coherent state via heterodyne measurement. This estimation method is tight and robust for weak signal pulses such as those used in QKD, and applicable to the digitized signal processing. We then construct a binary-phase-modulated CV-QKD protocol and prove its security against general attacks, based on a proof techniques of DV QKD. Such a complete security proof is the first step towards exploiting the benefits of CV QKD while ensuring its security. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
quantum cryptography / continuous-variable quantum key distribution / homodyne/heterodyne measurement / coherent state / fidelity / / / |
| Reference Info. |
IEICE Tech. Rep. |
| Paper # |
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| Download PDF |
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| Conference Information |
| Committee |
QIT |
| Conference Date |
2020-12-10 - 2020-12-11 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Online |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
Quantum Information |
| Paper Information |
| Registration To |
QIT |
| Conference Code |
2020-12-QIT |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Security of continuous variable quantum key distribution with digital signal processing |
| Sub Title (in English) |
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| Keyword(1) |
quantum cryptography |
| Keyword(2) |
continuous-variable quantum key distribution |
| Keyword(3) |
homodyne/heterodyne measurement |
| Keyword(4) |
coherent state |
| Keyword(5) |
fidelity |
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| 1st Author's Name |
Takaya Matsuura |
| 1st Author's Affiliation |
The University of Tokyo (U-Tokyo) |
| 2nd Author's Name |
Kento Maeda |
| 2nd Author's Affiliation |
The University of Tokyo (U-Tokyo) |
| 3rd Author's Name |
Toshihiko Sasaki |
| 3rd Author's Affiliation |
The University of Tokyo (U-Tokyo) |
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Masato Koashi |
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The University of Tokyo (U-Tokyo) |
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| Speaker |
Author-1 |
| Date Time |
2020-12-10 10:10:00 |
| Presentation Time |
20 minutes |
| Registration for |
QIT |
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| Volume (vol) |
vol. |
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