Compact Spin Qubits Using The Common Gate Structure Of Fin Field-Effect Transistors

The sizes of commercial transistors are of nanometer order, and there have already been many proposals of spin qubits using conventional complementary metal-oxide-semiconductor transistors. However, most of the previously proposed spin qubits require many wires to control a small number of qubits. This causes a significant "jungle of wires" problem when the qubits are integrated into a chip. Herein, to reduce the complicated wiring, we theoretically consider spin qubits embedded into fin field-effect transistor (FinFET) devices such that the spin qubits share the common gate electrode of the FinFET. The interactions between qubits occur via the Ruderman-Kittel-Kasuya-Yosida interaction via the channel of the FinFET. The possibility of a quantum annealing machine is discussed in addition to the quantum computers of the current proposals.