TL;DR
This paper introduces a new optical diode that operates at the few-photon level using a one-dimensional waveguide coupled asymmetrically to a two-level system, enabling directional photon transmission.
Contribution
It presents an exact analysis of single and two-photon transport showing asymmetric two-photon current, demonstrating a novel optical diode at the quantum level.
Findings
Two-photon current is asymmetric due to asymmetric coupling.
The system enables efficient unidirectional photon transmission.
The scheme operates effectively at the few-photon level.
Abstract
We propose a novel scheme of realizing an optical diode at the few-photon level. The system consists of a one-dimensional waveguide coupled asymmetrically to a two-level system. The two or multi-photon transport in this system is strongly correlated. We derive exactly the single and two-photon current and show that the two-photon current is asymmetric for the asymmetric coupling. Thus the system serves as an optical diode which allows transmission of photons in one direction much more efficiently than the opposite.
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