Multivariate filter banks with a polyphase matrix built by matrix factorization （lattice structure） were proposed to obtain orthonormal wavelet basis. On the basis of that, we propose a general method of constructin...Multivariate filter banks with a polyphase matrix built by matrix factorization （lattice structure） were proposed to obtain orthonormal wavelet basis. On the basis of that, we propose a general method of constructing filter banks which ensure second and third accuracy of its corresponding scaling function. In the last part, examples with second and third accuracy are given.展开更多
A novel double coupling planar structure(a single microstrip line coupled with two resonators coincidental)is presented for the first time.Based on this structure,a six-pole parallel-coupled high-temperature supercond...A novel double coupling planar structure(a single microstrip line coupled with two resonators coincidental)is presented for the first time.Based on this structure,a six-pole parallel-coupled high-temperature superconducting bandpass filter with both linear phase response and quasi-elliptic function response is designed.The filter has a 40 MHz passband with a center frequency of 2,000 MHz.Its dimension is18.67 mm 9 25.96 mm.At 77 K,minimum insertion loss is0.26 dB in passband.The group delay variation is\3 ns over70%of the filter bandwidth.展开更多
本研究针对未知参数可用精度极限的有效寻找问题进行探讨。在量子Ziv-Zakai界限(Quantum Ziv-Zakai bound,QZZB)的框架内,利用无噪声线性放大(Noiseless linear amplification,NLA)技术对初始相干态进行处理,研究在光子损耗和相位扩散...本研究针对未知参数可用精度极限的有效寻找问题进行探讨。在量子Ziv-Zakai界限(Quantum Ziv-Zakai bound,QZZB)的框架内,利用无噪声线性放大(Noiseless linear amplification,NLA)技术对初始相干态进行处理,研究在光子损耗和相位扩散的噪声环境下相位估计性能的改善情况。结果显示,通过增加NLA增益因子,可以显著提升QZZB在光子损失和相位扩散情况下的相位估计性能,尤其在严重光子损耗时提升效果更为显著。这些发现对于复杂环境下量子信息处理任务具有重要的指导作用。展开更多
基金Supported by Prof. Y.Xu under his grant in Program of "One Hundred Distinguished Chinese Scientists" of the Chinese Academy of Sciencesthe National Natural Science Foundation of China(No.10371122)Postgraduate Innovation Fund of the Chinese Academ
文摘Multivariate filter banks with a polyphase matrix built by matrix factorization （lattice structure） were proposed to obtain orthonormal wavelet basis. On the basis of that, we propose a general method of constructing filter banks which ensure second and third accuracy of its corresponding scaling function. In the last part, examples with second and third accuracy are given.
文摘A novel double coupling planar structure(a single microstrip line coupled with two resonators coincidental)is presented for the first time.Based on this structure,a six-pole parallel-coupled high-temperature superconducting bandpass filter with both linear phase response and quasi-elliptic function response is designed.The filter has a 40 MHz passband with a center frequency of 2,000 MHz.Its dimension is18.67 mm 9 25.96 mm.At 77 K,minimum insertion loss is0.26 dB in passband.The group delay variation is\3 ns over70%of the filter bandwidth.
文摘本研究针对未知参数可用精度极限的有效寻找问题进行探讨。在量子Ziv-Zakai界限(Quantum Ziv-Zakai bound,QZZB)的框架内,利用无噪声线性放大(Noiseless linear amplification,NLA)技术对初始相干态进行处理,研究在光子损耗和相位扩散的噪声环境下相位估计性能的改善情况。结果显示,通过增加NLA增益因子,可以显著提升QZZB在光子损失和相位扩散情况下的相位估计性能,尤其在严重光子损耗时提升效果更为显著。这些发现对于复杂环境下量子信息处理任务具有重要的指导作用。
