Optically induced spin gates in coupled quantum dots using the electron-hole exchange interaction

TL;DR

This paper proposes a fast optical method to implement a two-qubit -phase gate between spins in coupled quantum dots, utilizing electron-hole exchange interaction to enable entanglement.

Contribution

It introduces a novel optically controlled two-qubit gate leveraging electron-hole exchange in coupled quantum dots, advancing quantum information processing techniques.

Findings

Demonstrates a feasible scheme for a two-qubit -phase gate

Shows the gate can generate entangled spin states

Highlights the role of electron-hole exchange in isolating transitions

Abstract

We propose a fast optically induced two-qubit \textsc{c-phase} gate between two resident spins in a pair of coupled quantum dots. An excited bound state which extends over the two dots provides an effective electron-electron exchange interaction. The gate is made possible by the electron-hole exchange interaction, which isolates a single transition in the system. When combined with appropriate single qubit rotations, this gate generates an entangled state of the two spins.