Chin. Phys. Lett.  2006, Vol. 23 Issue (11): 2897-2899    DOI:
Original Articles |
Efficient Quantum Cryptography Network without Entanglement and Quantum Memory
LI Chun-Yan1,2;LI Xi-Han1,2;DENG Fu-Guo1,2,3;ZHOU Ping1,2;LIANG Yu-Jie1,2;ZHOU Hong-Yu1,2,3
1The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875 2Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875 3Beijing Radiation Center, Beijing 100875
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LI Chun-Yan, LI Xi-Han, DENG Fu-Guo et al  2006 Chin. Phys. Lett. 23 2897-2899
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Abstract An efficient quantum cryptography network protocol is proposed with $d$-dimensional polarized photons, without resorting to entanglement and quantum memory. A server on the network, say Alice, provides the service for preparing and measuring single photons whose initial state are |0>. The users code the information on the single photons with some unitary operations. To prevent the untrustworthy server Alice from eavesdropping the quantum lines, a nonorthogonal-coding technique is used in the process that the quantum signal is transmitted between the users. This protocol does not require the servers and the users to store the quantum states and almost all of the single photons can be used for carrying the information, which makes it more convenient for application than others with present technology. We also discuss the case with a faint laser pulse
Keywords: 03.67.Dd      03.67.Hk     
Published: 01 November 2006
PACS:  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Hk (Quantum communication)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2006/V23/I11/02897
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LI Chun-Yan
LI Xi-Han
DENG Fu-Guo
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LIANG Yu-Jie
ZHOU Hong-Yu
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Supported by the Fundamental Research Funds for the Central Universities (Grant No. 2019XD-A02), and the State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (Grant No. IPO2019ZT06).

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