| 量子密码通信中量子比特率理论分析 |
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| 引用本文： | 马晶,张光宇,谭立英,王强.量子密码通信中量子比特率理论分析[J].量子光学学报,2006,12(1):36-39. |
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| 作者姓名： | 马晶 张光宇 谭立英 王强 |
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| 作者单位： | 1. 哈尔滨工业大学,可调谐激光技术国家级重点实验室,黑龙江,哈尔滨,150001
2. 哈尔滨工业大学,可调谐激光技术国家级重点实验室,黑龙江,哈尔滨,150001;哈尔滨理工大学,应用科学学院,黑龙江,哈尔滨,150080 |
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| 摘 要： | 在量子密钥分配中,量子比特率是一个重要的系统参数。通过引入测量因子和筛选因子,建立了基于理想单光子源和泊松分布单光子源的量子比特率理论模型,给出了量子比特率的表达式,并对两种单光子源进行了比较分析。结果表明,当平均光子数大于1时,泊松分布单光子源能被优化。在发射机脉冲重复率一定的条件下,采用泊松分布单光子源无法达到理想单光子源的量子比特率,这是为保密通信所必须付出的代价。
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| 关 键 词： | 量子密码术 量子密钥分配 量子比特率 单光子源 |
| 文章编号： | 1007-6654（2006）01-0036-04 |
| 收稿时间： | 2004-12-27 |
| 修稿时间： | 2004年12月27 |
Theoretical Analysis of Quantum Bit Rate in Quantum Cryptography |
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| MA Jing,ZHANG Guang-yu,TAN Li-ying,WANG Qiang.Theoretical Analysis of Quantum Bit Rate in Quantum Cryptography[J].Acta Sinica Quantum Optica,2006,12(1):36-39. |
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| Authors: | MA Jing ZHANG Guang-yu TAN Li-ying WANG Qiang |
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| Institution: | 1. National Key Laboratory of Tunable Laser Technology, Harbin lnsthate of Technology, Harbin 150001, China; 2. College of Applied ,Scie, nces, Harbin University of Science and Technology, Harbin 150080, China |
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| Abstract: | Quantum bit rate is an important operating parameter in quantum key distribution.The theoretical models based on an ideal single-photon source and a single-photon source with Poisson distribution are established by introducing the measuring factor and the shifting factor,and the expressions of quantum bit rate are given.The two single-photon sources are analyzed by comparison.The results show that quantum bit rate based on the ideal single-photon source cannot be obtained when the transmitter pulse repetition rate is definite and the single-photon source with Poisson distribution is used,and this is the price paid for secret communication. |
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| Keywords: | quantum cryptography quantum key distribution quantum bit rate single-photon source |
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