Experimental demonstration of five-photon entanglement and open-destination teleportation

Quantum-mechanical entanglement of three or four particles has been achieved experimentally, and has been used to demonstrate the extreme contradiction between quantum mechanics and local realism. However, the realization of five-particle entanglement remains an experimental challenge. The ability to manipulate the entanglement of five or more particles is required for universal quantum error correction. Another key process in distributed quantum information processing, similar to encoding and decoding, is a teleportation protocol that we term 'open-destination' teleportation. An unknown quantum state of a single particle is teleported onto a superposition of N particles; at a later stage, this teleported state can be read out (for further applications) at any of the N particles, by a projection measurement on the remaining particles. Here we report a proof-of-principle demonstration of five-photon entanglement and open-destination teleportation (for N = 3). In the experiment, we use two entangled photon pairs to generate a four-photon entangled state, which is then combined with a single-photon state. Our experimental methods can be used for investigations of measurement-based quantum computation and multi-party quantum communication.     

耐水脱硫石膏、粉煤灰胶结材的研究

本文较深入地研究了脱硫石膏粉煤灰化学成分、杂质、颗粒特征和激发剂等对脱硫石膏、粉煤灰胶结材性能的影响 研究表明 ,激发剂是影响脱硫石膏、粉煤灰胶结材性能的主要因素 这为脱硫石膏、粉煤灰资源化利用打下良好理论基础 经实际应用表明 ,研究结果与实际情况能很好相符     

Non-specific esterases in females ofAedes aegypti (L.)

Zusammenfassung Unspezifische Esterasen wurden während des Adultlebens vonAedes aegypti (L.) quantitativ bestimmt und zwischen Weibchen von 2 Stämmen verglichen. Alterungist begleitet von einer Zunahme der Bänderzahl und einer Abnahme der Esterasenaktivität pro Weibchen; die relative Aktivität der einzelnen Esterasen-Isozyme bleibt aber mehr oder weniger konstant. Nach einem Blutmahl, dem Beginn eines neuen gonotrophen Zyklus, wurden auffällige Veränderungen im Bändermuster festgestellt. 4 Tage später, nach erfolgter Eiablage, ist dieses Muster wieder ähnlich wie vor der Blutaufnahme.     

Determination of uric acid and hematin in a single sample of excreta from blood-fed insects

Summary Uric acid and hematin, the principle excretory products in blood-fed mosquitoes can be determined quantitatively in the presence of each other in fecal material from individual females.The investigation was supported by a research grant from the Swiss National Science Foundation. The assistance of Mrs E. Csibi and Mrs U. Briegel is gratefully, acknowledged.     

Structural diversity of trypsin from different mosquito species feeding on vertebrate blood

Mosquito trypsin was purified using a combination of ion exchange and affinity chromatography with the ligand soybean trypsin inhibitor. Three Aedes and three Anopheles species were tested, all of which are specialized in the digestion of vertebrate blood. Amino-terminal sequences of HPLC-purified trypsins from Aedes aegypti and Anopheles quadrimaculatus revealed homologies of 30-40% with vertebrate and other invertebrate proteases previously identified as serine-proteases. The purified mosquito trypsins have molecular masses between 25 kDa and 36 kDa, as determined by denaturing polyacrylamide electrophoresis, and are heterogeneous in size and number in the various species. The number of SDS-bands varies between 3 and 6 in Aedes and between 1 and 3 in Anopheles. The specific activities, determined with the substrate TAME, range from 240 U/mg in Aedes aegypti to 1065 U/mg in Anopheles quadrimaculatus. All mosquito trypsins tested have acidic isoelectric points between pH 3.5 and pH 5.4. No alkaline proteases were detected. Polyclonal antisera against Aedes aegypti and Anopheles albimanus trypsin do not cross-react with bovine trypsin. Cross-reactivity of the two sera with trypsin from six mosquito species suggests the presence of at least 2 enzyme families.     

正弦稳态扫频信号的产生与输出

介绍用计算机软件产生正弦稳态扫频信号的编程方法。通过对Ｄ／Ａ变换与Ａ／Ｄ采集的同步输出可以获得不同频率量程和设定电压的扫频输出     

一类高阶非线性系统的零解稳定性

由Барбащин公式得到的四阶常系数线性系统的Ляпунов函数出发，通过类比法构造了一类四阶非线性系统的Ляпунов函数，并由此得到了这些系统零解的全局渐近稳定性的充分条件     

Structural diversity of trypsin from different mosquito species feeding on vertebrate blood

Summary Mosquito trypsin was purified using a combination of ion exchange and affinity chromatography with the ligand soybean trypsin inhibitor. ThreeAedes and threeAnopheles species were tested, all of which are specialized in the digestion of vertebrate blood. Amino-terminal sequences of HPLC-purified trypsins fromAedes aegypti andAnopheles quadrimaculatus revealed homologies of 30–40% with vertebrate and other invertebrate proteases previously identified as serine-proteases. The purified mosquito trypsins have molecular masses between 25 kDa and 36 kDa, as determined by denaturing polyacrylamide electrophoresis, and are heterogeneous in size and number in the various species. The number of SDS-bands varies between 3 and 6 inAedes and between 1 and 3 inAnopheles. The specific activities, determined with the substrate TAME, range from 240 U/mg inAedes aegypti to 1065 U/mg inAnopheles quadrimaculatus. All mosquito trypsins tested have acidic isoelectric points between pH 3.5 and pH 5.4. No alkaline proteases were detected. Polyclonal antisera againstAedes aegypti andAnopheles albimanus trypsin do not cross-react with bovine trypsin. Cross-reactivity of the two sera with trypsin from six mosquito species suggests the presence of at least 2 enzyme families.