| 摘要 |
PURPOSE:To increase bit density without fine work of a biassing electrode, by enabling an elastic surface wave to move flux quanta in a Josephson junction or junction array at the speed of sound in order to attain logical operation. CONSTITUTION:Onto substrate 5 of glass, etc., elastic surface wave transducer 1 is provided via ZnO piezoelectric film 2. As for Josephson junction array 3, PbO32 of l in thickness is sandwiched between superconductive metal Pb thin films 31 and 32, and electric path 35 is formed through SiO234. Applying DC voltage V between films 31 and 32 causes vibration at f=2eV/h. When an elastic surface wave from transducer 1 passes right under junction array 3, constant-current supply 7 supplies flux quantum ''1'' or ''0'' to each junction synchronizing with the wave corresponding to a digital signal. If the wavelength of the elastic surface wave is equal to the distance between junctions, the flux quantum is acquired by a wave-shaped potential, which is carried to detector 4 at the speed of sound, so that the digital signal equivalent to the flux quantum can be read out. |
