%0 Journal Article
%T Quantum Cryptography in Spin Networks
%A DENG Hong-Liang
%A FANG Xi-Ming
%A <br>邓洪亮
%A 方细明
%J 中国物理快报
%D 2007
%I 
%X In this paper we propose a new scheme of long-distance quantum cryptography based on spin networks with qubits stored in electron spins of quantum dots. By conditional Faraday rotation, single photon polarization measurement, and quantum state transfer, maximal-entangled Bell states for quantum cryptography between two long-distance parties are created. Meanwhile, efficient quantum state transfer over arbitrary distances is obtained in a spin chain by a proper choice of coupling strengths and using spin memory technique improved. We also analyse the security of the schemeagainst the cloning-based attack which can be also implemented in spin network and discover that this spin network cloning coincides with the optimal fidelity achieved by an eavesdropper for entanglement-based cryptography.
%K 03
%K 67
%K Dd
%K 78
%K 67
%K Hc
%K 03
%K 67
%K -a<br>量子密码
%K 自旋结网圈
%K 圈量子引力
%K 量子学
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=5C47498661940BB72BCD44D5B7023EB7&yid=A732AF04DDA03BB3&vid=B91E8C6D6FE990DB&iid=708DD6B15D2464E8&sid=E284E18FD9B34CE1&eid=30C8F497B33A9643&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=20