Deterministic CNOT Gate on electron qubits using quantum-dot spins in double-sided optical microcavities

TL;DR

This paper presents a scheme for a deterministic CNOT gate using electron spins in quantum dots within double-sided microcavities, enabling scalable solid-state quantum computing with current technology.

Contribution

It introduces a new method for constructing a deterministic CNOT gate on electron-spin qubits using quantum-dot spins in microcavities, operable in both weak and strong coupling regimes.

Findings

High fidelities achievable with low side leakage to cavity loss ratio

Device feasible with current technology

Operates effectively in both coupling regimes

Abstract

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.