Optically controlled phase gate and teleportation of a controlled-NOT gate for spin qubits in quantum dot-microcavity coupled system

摘要

Assisted with linear optical manipulation, single photon, entangled photonpairs, photon measurement, and classical communication, a scheme for two-spinqubits phase gate and teleportation of a CNOT gate between two electron spinsfrom acting on local qubits to acting on remote qubits using quantum dots inoptical microcavities is proposed. The scheme is based on spin selective photonreflection from the cavity and is achieved in a deterministic way by thesequential detection of photons and the single-qubit rotations of a singleelectron spin in a self-assembled GaAs/InAs quantum dot. The feasibility of thescheme is assessed showing that high average fidelities of the gates areachievable in the weak-coupling regime when the side leakage and cavity lossare low. The scheme opens promising perspectives for long-distance quantumcommunication, distributed quantum computation, and constructing remote quantuminformation processing networks.