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We propose a deterministic and scalable scheme to construct a two-qubitcontrolled-NOT (CNOT) gate and realize entanglement swapping between photonicqubits using a quantum-dot (QD) spin in a double-sided optical microcavity. Thescheme is based on spin selective photon reflection from the cavity and can beachieved in a nondestructive and heralded way. We assess the feasibility of thescheme and show that the scheme can work in both the weak coupling and thestrong coupling regimes. The scheme opens promising perspectives forlong-distance photonic quantum communication and distributed quantuminformation processing.

Deterministic CNOT gate and entanglement swapping for photonic qubits using a quantum-dot spin in a double-sided optical microcavity