Quantum switch based on coupled waveguides

The problem of construction of quantum multiplexer is discussed. A possible construction based on resonance transport properties of quantum waveguides coupled through small windows is considered. Small apertures play double r ole of "connecting channels" and "resonant elements". Transmission coeffici ents for the system are determined. The workability of the device as a quan tum switch to one of three (or to two of three) channels is discussed. Cont rol parameters for the switch are electron energy and bias voltage.