Quantum-state transfer from an ion to a photon

TL;DR

This paper demonstrates a method to transfer the quantum state of a single ion onto a photon within an optical cavity, advancing the development of ion-based quantum networks by enabling efficient and coherent quantum communication.

Contribution

We present a deterministic, high-efficiency method for mapping an ion's quantum state onto a photon, crucial for scalable quantum network implementation.

Findings

Achieved coherent quantum state transfer from ion to photon

Demonstrated high-efficiency photon generation within an optical cavity

The process is time-independent, allowing detailed characterization

Abstract

A quantum network requires information transfer between distant quantum computers, which would enable distributed quantum information processing and quantum communication. One model for such a network is based on the probabilistic measurement of two photons, each entangled with a distant atom or atomic ensemble, where the atoms represent quantum computing nodes. A second, deterministic model transfers information directly from a first atom onto a cavity photon, which carries it over an optical channel to a second atom; a prototype with neutral atoms has recently been demonstrated. In both cases, the central challenge is to find an efficient transfer process that preserves the coherence of the quantum state. Here, following the second scheme, we map the quantum state of a single ion onto a single photon within an optical cavity. Using an ion allows us to prepare the initial quantum state in a deterministic way, while the cavity enables high-efficiency photon generation. The mapping process is time-independent, allowing us to characterize the interplay between efficiency and fidelity. As the techniques for coherent manipulation and storage of multiple ions at a single quantum node are well established, this process offers a promising route toward networks between ion-based quantum computers.