Quantum Interfaces Using Nanoscale Surface Plasmons

TL;DR

This paper proposes a nanoscale surface plasmon-based quantum interface that enables efficient conversion and manipulation of qubits, supporting key functions for scalable quantum networks with high robustness and fidelity.

Contribution

It introduces a novel quantum interface using nanoscale surface plasmons for improved quantum network operations and scalability.

Findings

Numerical simulations demonstrate high fidelity and robustness against imperfections.

The interface enables efficient qubit-photon conversion and entanglement.

Potential for scalable quantum computing applications.

Abstract

The strong coupling between individual optical emitters and propagating surface plasmons confined to a conducting nanotip make this system act as an ideal interface for quantum networks, through which a stationary qubit and a flying photon (surface plasmon) qubit can be interconverted via a Raman process. This quantum interface paves the way for many essential functions of a quantum network, including sending, receiving, transferring, swapping, and entangling qubits at distributed quantum nodes as well as a deterministic source and an efficient detector of a single-photon. Numerical simulation shows that this scheme is robust against experimental imperfections and has high fidelity. Furthermore, being smaller this interface would significantly facilitate the scalability of quantum computers.