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

TL;DR

This paper proposes a deterministic optical scheme for implementing a two-spin qubits phase gate and teleporting a CNOT gate between remote electron spins in quantum dot-microcavity systems, enabling advances in quantum communication and distributed quantum computing.

Contribution

It introduces a novel, deterministic optical protocol for remote quantum gate operations using spin selective photon reflection and photon detection in quantum dot-microcavity systems.

Findings

High gate fidelities are achievable in weak-coupling regimes.

The scheme is feasible with low cavity leakage and loss.

It enables long-distance quantum communication and distributed quantum computation.

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.