Quantum logical gates operating on stored light

TL;DR

This paper proposes a method to perform quantum logical gates on stored light by manipulating atomic excitations in a medium, enabling quantum computation with photons without directly processing the photons.

Contribution

It introduces a novel approach to implement single-qubit gates on polarized photons via light storage in atomic media, advancing quantum information processing techniques.

Findings

Demonstrates feasibility of gates like phase, NOT, , and Hadamard on stored light

Uses atomic excitations in a tripod configuration for qubit transformations

Provides a new method for quantum gates without direct photon manipulation

Abstract

An implementation is proposed of single qubit gates, e.g., phase, NOT, \sqrt{NOT} and Hadamard, operating on polarized photons and based on light storage. Instead of processing photons themselves, qubit transformations are performed on atomic excitations due to photon storage in a medium of atoms in the tripod configuration.