Single-photon Quantum Router by Two Distant Artificial Atoms

TL;DR

This paper proposes a tunable quantum router for single photons using two distant artificial atoms, exploiting quantum interference to control photon transmission and routing without classical fields, advancing quantum communication networks.

Contribution

It introduces a novel single-photon routing scheme based on quantum interference with distant atoms, enabling control via atomic detuning and distance without classical fields.

Findings

Achieves perfect photon transmission or redirection based on atom phase shifts.

Demonstrates control of routing through atomic detuning and interatomic distance.

Operates without classical fields, simplifying quantum network implementation.

Abstract

Nowadays, quantum router is playing a key role in quantum communication and quantum network- s. Here we propose a tunable single-photon routing scheme, based on quantum interference, which uses two distant artificial atoms coupling to two transmission lines. Depending on the distance between the two atoms, the collective effect will lead to destructive or constructive interference between the scattered photons. Under standing wave condition, single photon from the incident channel can be perfectly transmitted or redirected into another channel by asymmetric or symmet- ric reflected phase shift of atoms, respectively. Therefore, we show that our router can be controlled by adjusting the detuning of the atoms and interatomic distance, without any classical field.