  We present an idea for detecting gravitational waves (GWs) by measuring the
current induced in a superconducting loop by the rotation of a frame to which
it is attached. The frame experiences a torque caused by a GW propagating
perpendicular to it because it is made of materials of different density in
adjacent quadrants. Superconducting Cooper pair system responds symmetrically
to the wave and stays at rest, while the ions of the superconductor are being
accelerated by the moving frame. This generates an electric current in the loop
which can be measured precisely by sensitive electronics. For that task the
antenna consists of two superconducting loops parallel to each other. One of
them, the primary loop, rotationally oscillates because of the described
reasons, while the second stays at rest. In the oscillating loop the current
creates an oscillating magnetic flux. This flux should be compensated due to
fluxoid quantization, by the oppositely directed current in the non-moving,
secondary loop, in which the ions are at rest, and the Cooper pairs move. We
estimate the resulting signal/noise ratio and discuss the signal detectability.
Several designs are envisioned, both for terrestrial and for orbital
arrangements of the antenna.
