  We discuss the valley-orbit interaction (VOI) and the concept of VOI based
valleytronics. Potential of such valleytronics is illustrated, with graphene as
an example material, in several frontier applications comprising FETs, quantum
computing, and quantum communications. Two important devices are discussed as
examples, namely, 1) valley pair qubits in coupled graphene quantum dots, to
build quantum networks consisting of graphene and photons, and 2) valleybased
FETs consisting of graphene quantum wires (channels) and armchair graphene
nanoribbons (sources and drains), to build graphene-based, low-power FET
circuits. This demonstration makes the VOI-based valleytronics an attractive R
& D direction in the area of electronics.
