Error-rejecting quantum computing with solid-state spins assisted by low-Q optical microcavities

TL;DR

This paper proposes an efficient, error-rejecting quantum computing scheme using quantum dots in optical microcavities, achieving high fidelity entangling gates robust to imperfections, and feasible with current technology.

Contribution

It introduces a nearly unity fidelity entangling gate with recycling procedures for solid-state spins in microcavities, enhancing robustness and efficiency over prior methods.

Findings

High-fidelity entangling gate achievable with current parameters

Recycling procedure improves efficiency and error robustness

Feasible implementation with existing experimental technology

Abstract

We present an efficient proposal for error-rejecting quantum computing with quantum dots (QD) embedded in single-sided optical microcavities based on the interface between the circularly polarized photon and QDs. An almost unity fidelity of the quantum entangling gate (EG) can be implemented with a detectable error that leads to a recycling EG procedure, which improves further the efficiency of our proposal along with the robustness to the errors involved in imperfect input-output processes. Meanwhile, we discuss the performance of our proposal for the EG on two solid-state spins with currently achieved experiment parameters, showing that it is feasible with current experimental technology. It provides a promising building block for solid-state quantum computing and quantum networks.