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

Abstract

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

14 pages, 5 figures, to appear in Physical Review A

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• Deterministic CNOT gate and entanglement swapping for photonic qubits using a quantum-dot spin in a double-sided optical microcavity
• A proposal for the implementation of quantum gates in an optomechanical system via phonon blockade
• Entanglement purification of nonlocal quantum-dot-confined electrons assisted by double-sided optical microcavities
• Rooted-tree network for optimal non-local gate implementation
• Multiple multi-control unitary operations: implementation and applications
• Topological quantum walks in cavity-based quantum networks
• Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities
• Universal quantum gates for photon-atom hybrid systems assisted by bad cavities