Highly Scalable Quantum Router with Frequency-Independent Scattering Spectra

TL;DR

This paper introduces a highly scalable quantum router using a giant atom and coupled-resonator waveguide, achieving frequency-independent, stable, and universal routing with 100% transfer efficiency across the entire energy band.

Contribution

It presents a novel quantum router scheme that operates independently of photon frequency, enhancing stability and universality in quantum network routing.

Findings

Achieves 100% transfer rate over the entire energy band.

Supports multi-channel routing with high stability.

Provides a physical explanation for frequency-independent operation.

Abstract

Optical quantum routers play a crucial role in quantum networks and have been extensively studied in both theory and experiment, leading to significant advancements in their performance. However, these routers impose stringent requirements for achieving desired routing results, as the incident photon frequency must be in strict resonance with one or several specific frequencies. To address this challenge, we propose an efficient quantum router scheme composed of semi-infinite coupled-resonator waveguide (CRW) and a giant atom. The single-channel router scheme enables stable output with 100% transfer rate over the entire energy band of the CRW. Leveraging this intriguing result, we further propose a multi-channel router scheme that possesses high stability and universality, while also being capable of performing various functionalities. The complete physical explanation of the underlying mechanism for this intriguing result is also presented. We hope that quantum router with output results unaffected by the frequency of the incoming information carriers presents a more reliable solution for the implementation of quantum networks.