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Conference Paper: Improve the efficiency of a practical quantum key distribution system
Title | Improve the efficiency of a practical quantum key distribution system |
---|---|
Authors | |
Keywords | Dark count Coherent state Quantum key distribution Single photon detector |
Issue Date | 2007 |
Citation | Proceedings of SPIE - The International Society for Optical Engineering, 2007, v. 6710 How to Cite? |
Abstract | The performance of a practical quantum key distribution (QKD) system is often limited by the multi-photon state emission of its source and the dark counts of its detectors. Here, we present two methods to improve its performance. The first method is decoy state QKD: the sender randomly sends out weak coherent states with various average photon numbers (which are named as signal state and decoy states). In [14,15], we have performed the first experimental implementation of decoy state QKD over 15km and 60km respectively, thus dramatically increasing the distance and secure key generation rate of practical QKD systems. Our work has been followed up by many research groups worldwide [16-18]. The second scheme is QKD with "dual detectors" [19]: the legitimate receiver randomly uses either a fast (but noisy) detector or a quiet (but slow) detector to measure the incoming quantum signals. The measurement results from the quiet detector can be used to upper bound the eavesdropper's information, while the measurement results from the fast detector are used to generate a secure key. We applied this idea to various QKD protocols. Simulation results demonstrated significant improvements in both BB84 protocol with ideal single photon source and Gaussianmodulated coherent states protocol. |
Persistent Identifier | http://hdl.handle.net/10722/285613 |
ISSN | 2023 SCImago Journal Rankings: 0.152 |
DC Field | Value | Language |
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dc.contributor.author | Qi, Bing | - |
dc.contributor.author | Zhao, Yi | - |
dc.contributor.author | Ma, Xiongfeng | - |
dc.contributor.author | Lo, Hoi Kwong | - |
dc.contributor.author | Qian, Li | - |
dc.date.accessioned | 2020-08-18T04:56:12Z | - |
dc.date.available | 2020-08-18T04:56:12Z | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Proceedings of SPIE - The International Society for Optical Engineering, 2007, v. 6710 | - |
dc.identifier.issn | 0277-786X | - |
dc.identifier.uri | http://hdl.handle.net/10722/285613 | - |
dc.description.abstract | The performance of a practical quantum key distribution (QKD) system is often limited by the multi-photon state emission of its source and the dark counts of its detectors. Here, we present two methods to improve its performance. The first method is decoy state QKD: the sender randomly sends out weak coherent states with various average photon numbers (which are named as signal state and decoy states). In [14,15], we have performed the first experimental implementation of decoy state QKD over 15km and 60km respectively, thus dramatically increasing the distance and secure key generation rate of practical QKD systems. Our work has been followed up by many research groups worldwide [16-18]. The second scheme is QKD with "dual detectors" [19]: the legitimate receiver randomly uses either a fast (but noisy) detector or a quiet (but slow) detector to measure the incoming quantum signals. The measurement results from the quiet detector can be used to upper bound the eavesdropper's information, while the measurement results from the fast detector are used to generate a secure key. We applied this idea to various QKD protocols. Simulation results demonstrated significant improvements in both BB84 protocol with ideal single photon source and Gaussianmodulated coherent states protocol. | - |
dc.language | eng | - |
dc.relation.ispartof | Proceedings of SPIE - The International Society for Optical Engineering | - |
dc.subject | Dark count | - |
dc.subject | Coherent state | - |
dc.subject | Quantum key distribution | - |
dc.subject | Single photon detector | - |
dc.title | Improve the efficiency of a practical quantum key distribution system | - |
dc.type | Conference_Paper | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1117/12.730779 | - |
dc.identifier.scopus | eid_2-s2.0-42149135464 | - |
dc.identifier.volume | 6710 | - |
dc.identifier.spage | null | - |
dc.identifier.epage | null | - |
dc.identifier.issnl | 0277-786X | - |