Analysis on the effect of channel transmission rate on communication efficiency

Author(s):  
Huanguo Zhang ◽  
Wei Li ◽  
Xun Qu
2014 ◽  
Vol 14 (9&10) ◽  
pp. 845-856
Author(s):  
Song Lin ◽  
Gong-De Guo ◽  
Fei Gao ◽  
Xiao-Fen Liu

Decoherence-free subspace (DFS) is a valid solution to realize quantum communication over a collective noise channel, and has been widely studied. Generally speaking, replacing a qubit with a DFS state will cause the reduction of communication efficiency. However, in this letter, it is shown that some kinds of noises may not lower the transmission rate of quantum key distribution. To illustrate it, we propose two quantum key distribution protocols based on Bell states. Here, two nonorthogonal and unbiased sets in a DFS are constructed by linear combination of particles at different positions. Since $n-1$ classical bits are distributed by using $2n$ qubits in our protocols, the transmission rate is close to that of noiseless BB84 protocol. Furthermore, when considering the cost of transmitting classical bits, the efficiencies of these protocols are even higher than that of BB84 protocol.


Author(s):  
P. Hagemann

The use of computers in the analytical electron microscopy today shows three different trends (1) automated image analysis with dedicated computer systems, (2) instrument control by microprocessors and (3) data acquisition and processing e.g. X-ray or EEL Spectroscopy.While image analysis in the T.E.M. usually needs a television chain to get a sequential transmission suitable as computer input, the STEM system already has this necessary facility. For the EM400T-STEM system therefore an interface was developed, that allows external control of the beam deflection in TEM as well as the control of the STEM probe and video signal/beam brightness on the STEM screen.The interface sends and receives analogue signals so that the transmission rate is determined by the convertors in the actual computer periphery.


2019 ◽  
Vol 8 (2) ◽  
Author(s):  
Ngo Quang Son ◽  
Nguyen Thi Phuong

Traditional culture of ethnic minorities is the material and spiritual values that are accumulated and preservedin the whole history of ethnic minority development. In thatcommon cultural flow, every ethnic minorities group in ourcountry has its own characteristics in traditional culture.That identity is expressed firstly in language. Language is animportant element of the ethnic minorities character, therefore,the loss of language is the loss of a great asset, thereby leadingto the erasure of art literature, religious beliefs and the custom,customary law.Therefore, in the context of modern life, preserving andpromoting the cultural and linguistic identity of ethnicminorities is an urgent task. In particular, pay specialattention to the method of cultural preservation through thedevelopment of Information, Education and CommunicationModel in ethnic minorities languages in schools and localcommunities.


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