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We introduce a method for finding the required control parameters for a quantum computer that yields the desired quantum algorithm without invoking elementary gates. We concentrate on the Josephson charge-qubit model, but the scenario is readily extended to other physical realizations. Our strategy is to numerically find any desired double- or triple-qubit gate. The motivation is the need to significantly accelerate quantum algorithms in order to fight decoherence. 相似文献
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Juliana S Luz Celso RR Ramos Márcia CT Santos Patricia P Coltri Fernando L Palhano Debora Foguel Nilson IT Zanchin Carla C Oliveira 《BMC biochemistry》2010,11(1):22
Background
The archaeal exosome is formed by a hexameric RNase PH ring and three RNA binding subunits and has been shown to bind and degrade RNA in vitro. Despite extensive studies on the eukaryotic exosome and on the proteins interacting with this complex, little information is yet available on the identification and function of archaeal exosome regulatory factors. 相似文献8.
M. I. K. Santala A. S. Daavittila H. M. Lauranto R. R. E. Salomaa 《Applied physics. B, Lasers and optics》1997,64(3):339-347
Because of its large neutron capture cross-section, gadolinium (Gd) is widely used as burnable poison in nuclear reactors.
Only two of its naturally occurring seven isotopes are strong neutron absorbers; hence, it would be desirable to enrich Gd
in those isotopes. We demonstrate experimentally that significant enrichment can be achieved by two-step laser-ionization
by relatively broad-band (bandwidth 1–2 GHz) lasers and by utilizing the isotope shifts only. Our results indicate that the
content of the strong absorbers can be raised from the natural 30% to nearly 70%. We also compare the performance of this
partially enriched Gd to natural Gd and to pure 157Gd, the most strongly absorbing isotope, as burnable poison.
Received: 3 April 1996/Revised version: 14 October 1996 相似文献
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Jyrki K. Kauppinen Ilkka K. Salomaa Jari O. Partanen Matti R. Hollberg 《Optical Review》1997,4(2):293-296
The carousel interferometer is a new type of an interferometer, which has been invented at the University of Turku. It consists of a beamsplitter and five plane mirrors. Four of the mirrors are mounted on a carousel, which rotates back and forth. We have modified the interferometer for use in the Fourier-transform ultraviolet (FT-UV) spectroscopy. Test measurement with plasma radiation gives favourable results. The most important property, which makes the carousel interferometer suitable for UV measurements, is its good stability in modulation.Presented at 1996 International Workshop on Interferometry (IWI ‘96), August 27–29, Saitama, Japan. 相似文献
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We investigate the effects of external current noise on a microwave-driven Josephson junction. We show that the circle return map for the superconducting phase difference is stable with respect to the external noise and find that the effects of fluctuations on the route to chaos described with the circle map can be opposite to those for the Feigenbaum period-doubling cascade: increasing noise can here act as a control parameter triggering a periodically oscillating junction chaotic by generating an inflection point in the return (circle) map. This may prove important also for other physical systems, including charge density waves. 相似文献