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Fractal dimension of scattering equivalent section of aerosol and its calibration mechanism 总被引:1,自引:0,他引:1
The correct calibration of coefficients in the inversion model for aerosol mass concentration is the precondition of obtaining highly precise results. The concept of the fractal dimension of scattering equivalent section is presented, and the calibration mechanism of the fractal dimension is discussed. Based on the calibration mechanism, the stability of the fractal dimension is analyzed. Theoretical analysis and experimental results indicate that the fractal dimension obtained by the intersection point calibration method is stable, while that calibrated by the Gauss-Newton method is instable, which only describes the shape characteristic of a small sample. The study of the calibration mechanism for the fractal dimension markedly enhances the present model for aerosol mass concentration. 相似文献
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Multiparty quantum secret conference based on quantum encryption with pure entangled states
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We present a scheme for multiparty quantum remote secret conference
(MQRSC) with pure entangled states, not maximally entangled
multipartite quantum systems. The conferees first share a private
quantum key, a sequence of pure entangled states and then use them
to encode and decode the secret messages. The conferees exploit the
decoy-photon technique to ensure the security of the transmission of
qubits. This MQRSC scheme is more feasible and efficient than
others. 相似文献
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This paper presents a scheme for high-capacity three-party
quantum secret sharing with quantum superdense coding, following
some ideas in the work by Liu et al (2002 Phys. Rev. A
65 022304) and the quantum secret sharing scheme by Deng
et al (2008 Phys. Lett. A 372 1957). Instead of using
two sets of nonorthogonal states, the boss Alice needs only to
prepare a sequence of Einstein--Podolsky--Rosen pairs in
d-dimension. The two agents Bob and Charlie encode their
information with dense coding unitary operations, and security is
checked by inserting decoy photons. The scheme has a high capacity
and intrinsic efficiency as each pair can carry 2lbd bits of
information, and almost all the pairs can be used for carrying
useful information. 相似文献
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The protocol using spatial entanglement to purify polarization entanglement by entanglement transformation between different degrees of freedom in a realistic environment is elaborated. Our analyses show that the bit-flip error can be completely purified, but the pure maximally entangled state can not be obtained ultimately if the spatial entanglement is impure. The fidelity of the purified state is decided by the spatial entanglement. Furthermore, this protocol can also be extended to purify the multi-particle Greenberg—Horne—Zeilinger (GHZ) state. It is presented that the spatial entanglement can be served as another source to improve the quality of entanglement. 相似文献
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