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Chen D.,Xian Communication College
Quantum Information Processing | Year: 2015

The original measurement-device-independent quantum key distribution is reviewed and a modified protocol using rotation invariant photonic state is proposed. A hybrid encoding approach combined polarization qubit with orbit angular momentum qubit is adopted to overcome the polarization misalignment associated with random rotations in long-distance quantum key distribution. The initial encoding and final decoding of information in our MDI-QKD implementation protocol can be conveniently performed in the polarization space, while the transmission is done in the rotation invariant hybrid space. Our analysis indicates that both the secure key rate and transmission distance can be improved with our modified protocol owing to the lower quantum bit error rate. Furthermore, our hybrid encoding approach only needs to insert four q-plates in practical experiment and to overcome the polarization misalignment problem mentioned above without including any feedback control. © 2015, Springer Science+Business Media New York. Source

Li R.-D.,Xian Communication College
Lecture Notes in Electrical Engineering | Year: 2014

The basic theory and principle of ID3 algorithm of decision tree are presented in this paper, and this algorithm is adopted to conduct test and analysis on the profitability of the stock and sets of sample data to generate the decision tree model. © Springer-Verlag Berlin Heidelberg 2014. Source

Sun Y.,PLA Air Force Aviation University | Zhao S.,PLA Air Force Aviation University | Dong C.,PLA Air Force Aviation University | Dong C.,Xian Communication College
Guangxue Xuebao/Acta Optica Sinica | Year: 2016

The long-distance quantum key distribution network is difficult, since the secure transmission distance of traditional quantum key distribution (QKD) is not long enough. To overcome this problem, A measurement device independent (MDI) QKD protocol based on quantum memories(QM) and entangled photon sources(EPS) is proposed, as well as its network model. And indirectly heralding QM scheme and directly heralding QM with QM scheme based on EPS are compared. The relationships of the key generation rate, secure transmission distance, and hold time of quantum state about MDI-QKD protocol based on QM and EPS are also analyzed. The simulation results show that MDI-QKD based on QM and EPS compensate for the lack of MDI-QKD based on directly heralding QM, which is necessary for heralding QM, and the secure transmission distance is far higher than traditional MDIQKD and general MDI-QKD based on indirectly heralding QM. Furthermore, once the hold time of quantum state is greater than 1 ms, the key generation rate will be almost invariable. The double-channel and two-user network model are employed. The single-channel and multi-user QKD network can be implemented with time division multiplexer and fast optical switch. © 2016, Chinese Laser Press. All right reserved. Source

Zhu S.,Xidian University | Liao G.,Xidian University | Qu Y.,Xidian University | Liu X.,Xidian University | And 2 more authors.
IEEE Transactions on Geoscience and Remote Sensing | Year: 2010

This paper describes an ambiguity resolving approach for slant-range velocity estimation which utilizes the wideband characteristic of the transmitted signal (multiple wavelengths). Based on the wavelength dual-wavelength radar data. Then, two effective approaches are introduced to focus the moving target no matter the Doppler ambiguity exists or not. The slantrange velocity is estimated by the number of azimuth cell displacements between the two focused images. Both imaging methods have different properties and advantages. A performance analysis is made, and deleterious factors in practice are analyzed in detail. The effectiveness of the unambiguous slant-range velocity estimation approach is demonstrated with the use of simulated and real data. © 2009 IEEE. Source

Chen D.,Xian Communication College
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2016

The vector vortex (VV) beam, originally introduced to exhibit a form of single-particle quantum entanglement between different degrees of freedom, has specific applications for quantum-information protocols. In this paper, by combining measurement-device-independent quantum key distribution (MDIQKD) with a spontaneous parametric-downconversion source (SPDCS), we present a modified MDIQKD scheme with pairs of VV beams, which shows a structure of hybrid entangled entanglement corresponding to intrasystem entanglement and intersystem entanglement. The former entanglement, which is entangled between polarization and orbit angular momentum within each VV beam, is adopted to overcome the polarization misalignment associated with random rotations in quantum key distribution. The latter entanglement, which is entangled between the two VV beams, is used to perform the MDIQKD protocol with SPDCS to inherit the merit of the heralded process. The numerical simulations show that our modified scheme has apparent advances both in transmission distance and key-generation rate compared to the original MDIQKD. Furthermore, our modified protocol only needs to insert q plates in a practical experiment. © 2016 American Physical Society. Source

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