  A non-reciprocal quantum ring, where one arm of the ring contains the Rashba
spin-orbit interaction but not in the other arm, is found to posses very unique
electronic properties. In this ring the Aharonov-Bohm oscillations are totally
absent. That is because in a magnetic field the electron stays in the
non-Rashba arm, while it resides in the Rashba arm for zero (or negative)
magnetic field. The average kinetic energy in the two arms of the ring are
found to be very different. It also reveals different "spin temperature" in the
two arms of the non-reciprocal ring. The electrons are sorted according to
their spins in different regions of the ring by switching on and off (or
reverse) the magnetic field, thereby creating order without doing work on the
system. This resembles the action of a demon in the spirit of Maxwell's
original proposal, exploiting a non-classical internal degree of freedom. Our
demon clearly demonstrates some of the required features on the nanoscale.
