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Chinese Physics Letters

Efficient Quantum Cryptography Network without Entanglement and Quantum Memory

李 春艶, 李熙涵, Fu‐Guo Deng, 周萍, 梁玉洁, 周宏余

Published Jan 1, 2006• 0 citations
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Abstract

一个有效的量密码学网络协议被建议 withd 维的极化的光子，没有诉诸纠纷和量记忆。一个服务器在网络，说艾莉斯，为完全准备并且测量单个光子提供服务起始的状态是垂直的工具条 0 > 。用户与一些单一的操作在单个光子上编码信息。为了阻止不能信任的服务者艾莉斯偷听，量排队，一种编码 nonorthogonal 技术在量信号在用户之间被播送的过程被使用。这个协议不要求服务器和用户到量状态和几乎所有单个光子能被用于带信息的 storre，它然后为申请使它更方便其它与现在的技术。我们也与微弱激光脉搏讨论盒子。

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一个有效的量密码学网络协议被建议 withd 维的极化的光子，没有诉诸纠纷和量记忆。一个服务器在网络，说艾莉斯，为完全准备并且测量单个光子提供服务起始的状态是垂直的工具条 0 > 。用户与一些单一的操作在单个光子上编码信息。为了阻止不能信任的服务者艾莉斯偷听，量排队，一种编码 nonorthogonal 技术在量信号在用户之间被播送的过程被使用。这个协议不要求服务器和用户到量状态和几乎所有单个光子能被用于带信息的 storre，它然后为申请使它更方便其它与现在的技术。我们也与微弱激光脉搏讨论盒子。
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.
在这篇论文，我们基于旋转网络建议长途的量密码学的一个新计划， qubits 在量点的电子旋转存储了。由有条件的法拉第，旋转，单个光子极化测量，和量状态转，为在二个长途的聚会之间的量密码学的最大纠缠贝尔状态被创造。同时，在任意的距离上的有效的量状态转移被联合力量的一种合适的选择在旋转链获得，用旋转记忆，技术改善了。我们也对能也在旋转网络被实现并且发现克隆的这个旋转网络与一致，最佳的忠实为基于纠纷的密码学由一个偷听者完成了的基于克隆的攻击分析计划的安全。
方式を使い分けて送受信すると，量子的な性質が表れてき ます．とくに量子暗号では，不確定性原理という性質が本 質的になります． 2.2 光を弱める 物質を細かく測定する場合は分子レベルの精密測定をする と書きましたが，光の場合はそれが光を弱めることに相当 します．これが量子暗号ですべきことの一つ目です．具体 的にどれくらい光を弱めればいいかについても明確な基準 があって，それがエネルギー量子 (= hν ジュール．ただし
We propose a conditional quantum key distribution scheme with three nonorthogonal states. Combined with the idea presented by Lo et al. (H.-K. Lo, H. F. Chau, and M. Ardehali, e-print arXiv: quant-ph/0011056), the efficiency of this scheme is increased to tend to 100%. Also, such a refined data analysis guarantees the security of our scheme against the most general eavesdropping strategy. Then, based on the scheme, we present a quantum cryptography network with the addition of a device called ``space optical switch.'' Moreover, we give out a realization of a quantum random number generator. Thus, a feasible experimental scheme of this efficient quantum cryptography network is completely given.