Quantum Routing of Single Photons with Cyclic Three-Level System
Lan Zhou, Li-Ping Yang, Yong Li, C.P. Sun

TL;DR
This paper proposes a practical quantum router for single photons using a three-level atom in coupled-resonator waveguides, enabling controlled photon redirection with high efficiency based on coherent resonance.
Contribution
It introduces a novel, experimentally feasible single-photon routing scheme utilizing a cyclic three-level atom in quantum multi-channels, enhancing quantum network control.
Findings
Achieves perfect reflection of single photons in the incident channel.
Demonstrates controllable photon redirection via classical field manipulation.
Establishes the role of photonic bound states in routing efficiency.
Abstract
We propose an experimentally accessible single-photon routing scheme using a -type three-level atom embedded in quantum multi-channels composed of coupled-resonator waveguides. Via the on-demand classical field applied to the atom, the router can extract a single photon from the incident channel, and then redirect it into another. The efficient functions of perfect reflection of single photon signal in the incident channel is rooted in the coherent resonance and the existence of photonic bound states.
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