  We show that the U(2) group structure of thin barriers can be adopted for
quantum information processing when used in combination with environmental
potential whose bouncing modes are profile preserving. Qubits are realized as
wave functions localized in either side of the barrier which divides the
one-dimensional system into two regions. It is argued that this model is a
theoretical prototype of a robust and scalable quantum computing device.
  Keywords: Quantum Computation, Quantum Wire, Quantum Contact Interaction
