Arbitrary Rotation of a Single Spinwave Qubit in an Atomic-Ensemble Quantum Memory

TL;DR

This paper demonstrates the first experimental realization of high-fidelity single-qubit manipulation of spinwaves in an atomic ensemble quantum memory, enhancing its capabilities for scalable quantum networks.

Contribution

It introduces a method for arbitrary rotation of a single spinwave qubit using stimulated Raman transition and controlled Lamor precession in an atomic ensemble.

Findings

High-fidelity single-qubit operations achieved

Quantum state and process tomography confirm performance

Advances atomic-ensemble quantum memory capabilities

Abstract

We report the first experimental realization of single-qubit manipulation for single spinwaves stored in an atomic ensemble quantum memory. In order to have high-fidelity gate operations, we make use of stimulated Raman transition and controlled Lamor precession jointly. We characterize the gate performances with quantum state tomography and quantum process tomography, both of which imply that high-fidelity operations have been achieved. Our work complements the experimental toolbox of atomic-ensemble quantum memories by adding the capability of single-qubit manipulation, thus may have important applications in future scalable quantum networks.