Photonic Phase Gate via an Exchange of Fermionic Spin Waves in a Spin Chain

TL;DR

This paper introduces a novel method for implementing a two-qubit photonic phase gate by exchanging fermionic spin wave excitations in a spin chain, enabling controlled quantum operations with potential experimental realizations.

Contribution

It presents a new protocol that uses fermionic spin wave exchanges in a spin chain to realize a photonic phase gate, combining photon storage and atomic excitation manipulation.

Findings

Proposes a protocol for a two-qubit photonic phase gate using fermionic spin waves.

Discusses potential experimental systems and imperfections.

Provides a theoretical framework for implementing the gate.

Abstract

We propose a new protocol for implementing the two-qubit photonic phase gate. In our approach, the pi phase is acquired by mapping two single photons into atomic excitations with fermionic character and exchanging their positions. The fermionic excitations are realized as spin waves in a spin chain, while photon storage techniques provide the interface between the photons and the spin waves. Possible imperfections and experimental systems suitable for implementing the gate are discussed.