Economical quantum secure direct communication network with single photons
Deng Fu-Guo(邓富国)a)b)c)†, Li Xi-Han(李熙涵)a)b), Li Chun-Yan(李春燕)a)b), Zhou Ping(周萍)a)b), and Zhou Hong-Yu(周宏余)a)b)c)
a The Key Laboratory of Beam Technology and Material Modification of Ministry of Education,Beijing Normal University, Beijing 100875, Chinab Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875, China
Abstract In this paper a scheme for quantum secure direct communication (QSDC) network is proposed with a sequence of polarized single photons. The single photons are prepared originally in the same state $\vert 0\rangle$ by the servers on the network, which will reduce the difficulty for the legitimate users to check eavesdropping largely. The users code the information on the single photons with two unitary operations which do not change their measuring bases. Some decoy photons, which are produced by operating the sample photons with a Hadamard, are used for preventing a potentially dishonest server from eavesdropping the quantum lines freely. This scheme is an economical one as it is the easiest way for QSDC network communication securely.
Fund: Project supported
by the National Natural Science Foundation of
China (Grant Nos 10604008 and 10435020) and the Beijing Education
Committee (Grant No XK100270454).
Cite this article:
Deng Fu-Guo(邓富国), Li Xi-Han(李熙涵), Li Chun-Yan(李春燕), Zhou Ping(周萍), and Zhou Hong-Yu(周宏余) Economical quantum secure direct communication network with single photons 2007 Chinese Physics 16 3553
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