排序方式: 共有21条查询结果,搜索用时 15 毫秒
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Demonstration of controlled-NOT quantum gates on a pair of superconducting quantum bits 总被引:1,自引:0,他引:1
Quantum computation requires quantum logic gates that use the interaction within pairs of quantum bits (qubits) to perform conditional operations. Superconducting qubits may offer an attractive route towards scalable quantum computing. In previous experiments on coupled superconducting qubits, conditional gate behaviour and entanglement were demonstrated. Here we demonstrate selective execution of the complete set of four different controlled-NOT (CNOT) quantum logic gates, by applying microwave pulses of appropriate frequency to a single pair of coupled flux qubits. All two-qubit computational basis states and their superpositions are used as input, while two independent single-shot SQUID detectors measure the output state, including qubit-qubit correlations. We determined the gate's truth table by directly measuring the state transfer amplitudes and by acquiring the relevant quantum phase shift using a Ramsey-like interference experiment. The four conditional gates result from the symmetry of the qubits in the pair: either qubit can assume the role of control or target, and the gate action can be conditioned on either the 0-state or the 1-state. These gates are now sufficiently characterized to be used in quantum algorithms, and together form an efficient set of versatile building blocks. 相似文献
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E. A. Zeller H. Bloch E. Heitz M. Michels S. R. de Groot 《Cellular and molecular life sciences : CMLS》1946,2(12):506-507
Ohne Zusammenfassung 相似文献
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Yeast mitochondrial RNA does not contain poly(A) 总被引:5,自引:0,他引:5
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R. B. Bajnath J. A. Groot H. R. de Jonge M. Kansen J. Bijman 《Cellular and molecular life sciences : CMLS》1993,49(4):313-316
In excised inside-out membrane patches of the human colon carcinoma HT-29cl.19A cells a large conductance (373±10 pS) chloride channel was found. Channel activity could only be observed after excision of patches from cells incubated with calcium ionophore. The channel was never observed in cell-attached patches. The channel was strongly voltage dependent, being open only between +30 and –30 mV clamp potentials. The selectivity sequence among anions, deduced from reversal potentials, was I>Br>Cl>F>gluconate. The PNa/PCl was 0.09. Although a similar type of channel, has been described earlier, this is the first report stating its appearance in patches of intestinal epithelial cells requiring the combined action of Ca2+ ionophore and excision, suggesting its control by an intracellular compound. 相似文献
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S A Taylor R G Snell A Buckler C Ambrose M Duyao D Church C S Lin M Altherr G P Bates N Groot 《Nature genetics》1992,2(3):223-227
We have applied the technique of exon amplification to the isolation of genes from the chromosome 4p16.3 Huntington's disease (HD) candidate region. Exons recovered from cosmid Y24 identified cDNA clones corresponding to the alpha-subunit of adducin, a calmodulin-binding protein that is thought to promote assembly of spectrin-actin complexes in the formation of the membrane cytoskeleton, alpha-adducin is widely expressed and, at least in brain, is encoded by alternatively spliced mRNAs. The alpha-adducin gene maps immediately telomeric to D4S95, in a region likely to contain the HD defect, and must be scrutinized to establish whether it is the site of the HD mutation. 相似文献
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J. M. van Rossum M. J. W. J. Cornelissen C. Th. P. de Groot J. A. Th. M. Hurkmans 《Cellular and molecular life sciences : CMLS》1960,16(8):373-375
Zusammenfassung Pilocarpin ist ein geeignetes Beispiel einer parasympathischen Substanz mit dualistischer Wirkung. Auf Grund der Variationen in der Eigenaktivität (intrinsic activity) des Pilocarpins an verschiedenen Organen und Arten tritt entweder die parasympathomimetische oder die parasympatholytische Wirkung in den Vordergrund. 相似文献
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Résumé Une nouvelle méthode pour enregistrer le rythme nycthéméral des poissons plats (Pleuronectiformes) est décrite. Elle fait usage du voltage de l'induction produite dans une bobine, quand un poisson plat muni d'un aimant permanent passe dans son voisinage. Le dispositif fonctionne indépendamment de la vitesse de natation. 相似文献