Fast, High Fidelity Quantum Dot Spin Initialization without a Strong Magnetic Field by Two-Photon Processes

TL;DR

This paper proposes a method for rapid, high-fidelity electron spin initialization in quantum dots using two-photon processes, eliminating the need for strong magnetic fields, with simulations showing speeds up to 1.3 GHz and fidelity of 99.7%.

Contribution

It introduces a novel two-photon excitation technique for spin initialization in quantum dots that does not require strong magnetic fields.

Findings

Maximum initialization speed of 1.3 GHz

Maximum fidelity of 99.7%

Effective without a strong magnetic field

Abstract

We describe a proposal for fast electron spin initialization in a negatively charged quantum dot coupled to a microcavity without the need for a strong magnetic field. We employ two-photon excitation to access trion states that are spin forbidden by one-photon excitation. Our simulation shows a maximum initialization speed of 1.3 GHz and maximum fidelity of 99.7% with realistic system parameters.