共查询到19条相似文献,搜索用时 77 毫秒
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为了解决随机线性双折射对光纤磁光特性测量的影响,采用旋转光纤(SF)结合法拉第旋转镜(FRM)的测量方法,研究了FRM对旋转光纤磁光特性测量的影响。首先,从理论方面研究旋转光纤与FRM的引入如何减小光纤中的随机线性双折射对磁光特性测量的影响,并搭建基于FRM的旋转光纤磁光特性测试系统。当光源波长为1310 nm时,FRM作用前的旋转光纤费尔德常数都比未旋转光纤的大,且旋转光纤的节距越短,费尔德常数越大。特别是旋转光纤的节距为1.0 mm时,其费尔德常数为0.8304 rad/(T·m),比未旋转光纤的费尔德常数[0.8029 rad/(T·m)]增大了约3.43%。当测试系统加入FRM后,不同光纤的费尔德常数测量值相较于未使用FRM的光纤费尔德常数测量值都有一定幅度的增大,尤其相比于节距为1.0 mm时的旋转光纤更进一步提高了7.50%,并且在FRM作用前后不同光纤费尔德常数测量值的均方差分别为0.99%和0.61%,说明FRM的引入提高了掺杂光纤费尔德常数的测量精度与稳定性。 相似文献
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用单光子偏振态的量子密码通信实验 总被引:7,自引:0,他引:7
根据海森堡测不准原理,使用量子密码可以使通信双方不需要事先准备相同的密码本即可绝对保密地通信,我们基于单光子偏振态的方案利用四个发光二极管作为光子源进行了传送量子公开密钥的原理性实验,得到的未经纠错的系统误码率为6%。 相似文献
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通常来说,光子的探测过程是一个破坏性的过程.将光信号转化为电信号,通过对电信号探测来得到光场的信息.在此过程中,"消灭”掉了光子,"产生”了光电子,因而无法对同一光子进行重复测量.但量子力学从本质上并没有这样的限制.比如,采用量子非破坏(QNDquantum non-demolition)测量方案,在量子光学领域中,已经实现了光强度的QND测量. 光强度QND测量是通过参考光束得到信号光束信息的.让参考光束与信号光束发生非共振相互作用一这样既保证了相互之间没有能量的交换(即不破坏信号光束),又保证了参考光束能从信号光束中抽出信息,同时信号光束的信息体现在参考光束波函数变化的相位上,用光学干涉仪对此变化观测,就得到信号光束的信息. 相似文献
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反射镜组像旋转器的成像特性理论分析 总被引:4,自引:0,他引:4
以对像旋转器类棱镜的分析为基础,提出了用反射镜组作像旋转器的方法,并通过理论推导,证明该以射镜组具有像旋转器的作用。该反射镜组的优点在于能够适用于不同的工作波段范围,尤其适用于红外系统。 相似文献
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Cai Zhang Zhiwei Sun Yi Huang Dongyang Long 《International Journal of Theoretical Physics》2014,53(3):933-941
In this paper, we employ single photons in both polarization and spatial-mode degrees of freedom to design a quantum summation protocol. We assume that the third party, i.e. TP, is semi-honest in our protocol. That TP is semi-honest means TP executes the protocol loyally, keeps a record of all its intermediate computations and might try to steal the participants’ private inputs from the record, but he cannot be corrupted by the adversary. Participants can independently encode their private inputs on the polarization states and the spatial-mode states of single photons. Thus our protocol doubles the capacity of quantum communication compared with those based on single photons with only one degree of freedom. In addition, our protocol is feasible as the preparation and the measurement of single-photon quantum states in both the polarization and the spatial-mode degrees of freedom are available with current quantum techniques. We also analyze its security in this paper. 相似文献
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Haibin Wang Yugai Huang Xia Fang Bin Gu Desheng Fu 《International Journal of Theoretical Physics》2013,52(4):1043-1051
We present a high-capacity three-party quantum secret sharing (QSS) protocol with a sequence of single photons in both the polarization and the spatial-mode degrees of freedom. By inserting the boss Alice into the middle position between the two agents Bob and Charlie, our QSS protocol is secure in theory. The boss Alice chooses some unitary operations to encode her information on the single photons. It is interesting to point out the fact that Alice does not change the bases of the single photons which are used to carry the useful information about the private key, which improves its success probability for obtaining a private key. Compared with the QSS protocol by Zhou et al. (Chin. Phys. Lett. 24, 2181 (2007)), our QSS protocol has a higher capacity without increasing the difficulty of its implementation in experiment as each correlated photon can carry two bits of useful information. Compared with those QSS protocols based on entangled photon pairs and Bell-state measurements, our QSS protocol is more feasible as it does not require the complete Bell-state analysis which is not easy with linear optics. We give out the setup for the implementation of our QSS protocol with linear optical elements. 相似文献
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We present a high-capacity quantum secure direct communication (QSDC) protocol with single photons in both the polarization and the spatial-mode degrees of freedom. With a single photon traveling forth and back from the receiver to the sender, it can carry 2 bits of information as the sender can encode his message on both the polarization states and the spatial-mode states of single photons independently. Moreover, our QSDC protocol is feasible as the preparation and the measurement of a single-photon quantum state in both the polarization and the spatial-mode degrees of freedom is not difficult with current technology. 相似文献
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LiLi Wang WenPing Ma MeiLing Wang DongSu Shen 《International Journal of Theoretical Physics》2016,55(5):2490-2499
We present an efficient three-party quantum secure direct communication (QSDC) protocol with single photos in both polarization and spatial-mode degrees of freedom. The three legal parties’ messages can be encoded on the polarization and the spatial-mode states of single photons independently with desired unitary operations. A party can obtain the other two parties’ messages simultaneously through a quantum channel. Because no extra public information is transmitted in the classical channels, the drawback of information leakage or classical correlation does not exist in the proposed scheme. Moreover, the comprehensive security analysis shows that the presented QSDC network protocol can defend the outsider eavesdropper’s several sorts of attacks. Compared with the single photons with only one degree of freedom, our protocol based on the single photons in two degrees of freedom has higher capacity. Since the preparation and the measurement of single photon quantum states in both the polarization and the spatial-mode degrees of freedom are available with current quantum techniques, the proposed protocol is practical. 相似文献
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A dynamic quantum private comparison protocol based on the single photons in both polarization and spatial-mode degrees of freedom is proposed. In this protocol, any two parties of n(n ≥ 4) parties can compare their private information with the help of others n ? 2 parties. And any party can join in the protocol to take part in the comparison of n parties. Correctness analysis shows that the proposed protocol can be used to compare their information correctly. Security analysis shows that the proposed protocol can resist the general active attacks from an outside eavesdropper. And it can overcomes the problem of information leakage. 相似文献
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