  We propose a scheme to construct a deterministic CNOT gate on static
electron-spin qubits, allowing for deterministic scalable quantum computing in
solid-state systems.The excess electron confined in a charged quantum dot
inside a double-sided optical microcavity represents the qubit, and the single
photons play a medium role. Moreover, our device can work in both the weak
coupling and the strong coupling regimes, but high fidelities are achieved only
when the ratio of the side leakage to the cavity loss is low. Finally, we
assess the feasibility of this device and show it can be implemented with
current technology.
