| Experimental realization of quantum cryptography communication in free space |
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| 作者姓名： | WANG Chuan ZHANG Jingfu WANG Pingxiao DENG Fuguo AI Qing & LONG Guilu . |
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| 作者单位： | WANG Chuan1，ZHANG Jingfu1，WANG Pingxiao1，DENG Fuguo1，AI Qing1 & LONG Guilu1，2 1. Department of Physics，Key Laboratory for Quantum Information and Measurements，Tsinghua Univer- sity，Beijing 100084，China; 2. Center for Atomic and Molecular NanoSciences，Tsinghua University，Beijing 100084，China |
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| 基金项目： | 国家自然科学基金，中国博士后科学基金，国家科研项目 |
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| 摘 要： | Quantum cryptography is a new secure communication protocol with the combina- tion of quantum mechanics and information theory1]. Its security depends on the laws of physics and has been proved strictly2,3]. Quantum communication is the art of generat- ing and transmitting the keys through a quantum channel between two parties, usually called Alice and Bob. Unlike the classical key distribution, the quantum keys are gener- ated in the process of transmission instantaneously. The keys can be…
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Experimental realization of quantum cryptography communication in free space |
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| WANG Chuan,ZHANG Jingfu,WANG Pingxiao,DENG Fuguo,AI Qing & LONG Guilu, ..Experimental realization of quantum cryptography communication in free space[J].Science in China(Physics Astronomy),2005,48(2). |
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| Authors: | WANG Chuan ZHANG Jingfu WANG Pingxiao DENG Fuguo Ai Qing LONG Guilu |
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| Institution: | 1. Department of Physics, Key Laboratory for Quantum Information and Measurements, Tsinghua University, Beijing 100084, China
2. Department of Physics, Key Laboratory for Quantum Information and Measurements, Tsinghua University, Beijing 100084, China;Center for Atomic and Molecular NanoSciences, Tsinghua University, Beijing 100084, China |
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| Abstract: | Utilizing linear optical devices, the principle of B92 quantum key distribution (QKD) protocol is demonstrated in free space with a distance of transmission of 2.2 meters. The faint laser pulses with 650 nm wavelength are used as the single photon sources. The experimental results show that the eavesdropping behavior in the signal transmission can be detected. We also discuss the problems and solutions in using the quantum cryptography communication practically. It is pointed out that one of the approaches to increasing the distance of the quantum communication is to overcome the attenuation of the single photon in transmission. This could not be solved by the use of single photon source, and new quantum communication protocols are needed to solve these problems. |
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| Keywords: | quantum key distribution free space linear optics faint pulses |
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