Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2011, Vol. 34 ›› Issue (6): 33-37.doi: 10.13190/jbupt.201106.33.yangchy

• Papers • Previous Articles     Next Articles

Research on Enhancement of the Time of Arrival Measurement Base on Grouped-entangled Quantum

  

  • Received:2010-12-21 Revised:2011-08-15 Online:2011-12-28 Published:2011-10-18

Abstract:

According to the principles of quantum ranging, the time of arrival (TOA) can be measured in a much higher accuracy by utilizing a quantum pulse which includes entangled-squeezed photons, than that by utilizing a classical electromagnetic pulse. However, the maximal entangled quantum pulse has a very poor robustness of measurement in a non-ideal transmission channel, since the loss of a single photon will make the TOAs of other photons to be totally useless. A partially entangled quantum pulse will have a better robustness of measurement, whereas its measurement accuracy would be reduced with the decrease of entanglement. In order to solve problem between the accuracy and the robustness of the measurement, a new structure of quantum entanglement utilizing grouped and squeezed photons is proposed in this paper. Also, the relationship between the degree of entanglement, quantum transmission efficiency, and the measurement precision is deduced in detail to analyze the performance of this kind of quantum entanglement structure. Finally, considering the specific quantum transmission efficiency, the maximum accuracy gain of the measurement is obtained through the selection of a proper quantum entangle structure, the number of photons to be squeezed and the optimal degree of entanglement.

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