Non-reciprocal few-photon devices based on chiral waveguide-emitter couplings

TL;DR

This paper proposes a method to create efficient non-reciprocal few-photon devices using chiral waveguide-emitter couplings, enabling optical diodes and transistors at the quantum level with high efficiency.

Contribution

It introduces a novel approach leveraging chiral couplings for non-reciprocal quantum photonic devices, demonstrating diode and transistor functionalities at the single- and two-photon levels.

Findings

Achieves large non-reciprocal photon transport at the single-photon level.

Demonstrates transistor-like behavior for two-photon inputs.

Shows feasibility of experimental implementation.

Abstract

We demonstrate the possibility of designing efficient, non reciprocal few-photon devices by exploiting the chiral coupling between two waveguide modes and a single quantum emitter. We show how this system can induce non-reciprocal photon transport at the single-photon level and act as an optical diode. Afterwards, we also show how the same system shows a transistor-like behaviour for a two-photon input. The efficiency in both cases is shown to be large for feasible experimental implementations. Our results illustrate the potential of chiral waveguide-emitter couplings for applications in quantum circuitry.