Propagation of 1-THz bandwidth electrical pulses on YBa sub 2 Cu sub 3 O sub 7-delta transmission lines on lanthanum aluminate.

We study the propagation of 1-THz bandwidth electrical pulses on high critical current density c-axis oriented YBa sub 2 Cu sub 3 O sub 7-delta (YBCO) coplanar transmission lines deposited epitaxially on the low dielectric loss substrate lanthanum aluminate (LaAlO sub 3). The losses on the YBCO transmission line are lower than on an equivalent gold line on the same substrate at temperatures below 50 K. At higher temperatures, we find increasing loss and dispersion of the ultrashort electrical pulses.