In a practical quantum key distribution（QKD） system, imperfect equipment, especially the single-photon detector,can be eavesdropped on by a blinding attack. However, the original blinding attack may be discovered by...In a practical quantum key distribution（QKD） system, imperfect equipment, especially the single-photon detector,can be eavesdropped on by a blinding attack. However, the original blinding attack may be discovered by directly detecting the current. In this paper, we propose a probabilistic blinding attack model, where Eve probabilistically applies a blinding attack without being caught by using only an existing intuitive countermeasure. More precisely, our countermeasure solves the problem of how to define the bound in the limitation of precision of current detection, and then we prove security of the practical system by considering the current parameter. Meanwhile, we discuss the bound of the quantum bit error rate（QBER） introduced by Eve, by which Eve can acquire information without the countermeasure.展开更多
Due to a number of advantages, blind adaptive multiuser detector has become a research hotspot in recent years. But low convergence rate problem occurs to many blind adaptive algorithms. A new blind adaptive approach ...Due to a number of advantages, blind adaptive multiuser detector has become a research hotspot in recent years. But low convergence rate problem occurs to many blind adaptive algorithms. A new blind adaptive approach to multiuser detection is presented. The simulation results show that by reasonably choosing time varying step size, the proposed detector can not only improve the convergence rate, but also reduce the bit error rate (BER) of the system, and so it can effectively improve the system performance with less computational cost.展开更多
介绍了在近地空间环境的理想条件下,即时全球打击(prompt global strike,PGS)武器地球曲率限的最大可探测距离的计算方法。根据黑体辐射理论,估算了PGS在短波红外和日盲紫外波段的辐射量值。当PGS飞行速度高于5马赫数时,其辐射峰值波长...介绍了在近地空间环境的理想条件下,即时全球打击(prompt global strike,PGS)武器地球曲率限的最大可探测距离的计算方法。根据黑体辐射理论,估算了PGS在短波红外和日盲紫外波段的辐射量值。当PGS飞行速度高于5马赫数时,其辐射峰值波长位于短波红外波段,最适合使用短波红外探测器。虽然与短波红外能量相比,PGS的紫外辐射能量要小得非常多,但其紫外辐射光子个数仍然是一个巨量的值。具有单光子计数能力的短波红外和日盲紫外雪崩光电二极管或有实现PGS早期预警及最大可探测距离的潜力。展开更多
基金Project supported by the National Basic Research Program of China(Grant Nos.2011CBA00200 and 2011CB921200)the National Natural Science Foundation of China(Grant Nos.61475148,61201239,61205118,and 11304397)the China Postdoctoral Science Foundation(Grant No.2013M540514)
文摘In a practical quantum key distribution（QKD） system, imperfect equipment, especially the single-photon detector,can be eavesdropped on by a blinding attack. However, the original blinding attack may be discovered by directly detecting the current. In this paper, we propose a probabilistic blinding attack model, where Eve probabilistically applies a blinding attack without being caught by using only an existing intuitive countermeasure. More precisely, our countermeasure solves the problem of how to define the bound in the limitation of precision of current detection, and then we prove security of the practical system by considering the current parameter. Meanwhile, we discuss the bound of the quantum bit error rate（QBER） introduced by Eve, by which Eve can acquire information without the countermeasure.
文摘Due to a number of advantages, blind adaptive multiuser detector has become a research hotspot in recent years. But low convergence rate problem occurs to many blind adaptive algorithms. A new blind adaptive approach to multiuser detection is presented. The simulation results show that by reasonably choosing time varying step size, the proposed detector can not only improve the convergence rate, but also reduce the bit error rate (BER) of the system, and so it can effectively improve the system performance with less computational cost.
文摘介绍了在近地空间环境的理想条件下,即时全球打击(prompt global strike,PGS)武器地球曲率限的最大可探测距离的计算方法。根据黑体辐射理论,估算了PGS在短波红外和日盲紫外波段的辐射量值。当PGS飞行速度高于5马赫数时,其辐射峰值波长位于短波红外波段,最适合使用短波红外探测器。虽然与短波红外能量相比,PGS的紫外辐射能量要小得非常多,但其紫外辐射光子个数仍然是一个巨量的值。具有单光子计数能力的短波红外和日盲紫外雪崩光电二极管或有实现PGS早期预警及最大可探测距离的潜力。
