2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26281We present a high-sensitivity microwave vector detection system for studying the low-dimensional electron system embedded in the gaps of a coplanar waveguide at low temperatures. Using this system, we have achieved 0.005% and 0.001\textdegree resolutions in amplitude and phase variations, respectively, at 10 GHz in a magnetotransport measurement on a quantum-wire array with an average signal power less than $-$75 dBm into the sample at 0.3 K. From the measured phase variation, we can distinguish a very tiny change in the induced dipole moment of each quantum wire.3 pages, 2 figures, Appl. Rev. Lett. 85, 4196 (2004)Mesoscale and Nanoscale PhysicsOther Condensed Mattertext