# Time-frequency encoded single-photon sources and broadband quantum memories based on a tunable one-dimensional atom

## TL;DR

This paper proposes a tunable one-dimensional atom system with two interacting quantum emitters coupled to a cavity, enabling high-efficiency single-photon generation and broadband quantum memories for quantum networks.

## Contribution

It introduces a novel tunable atom model with controllable bandwidth and high efficiency, advancing quantum light sources and memories.

## Key findings

- Tunable optical resonances with constant mode coupling.
- Generation of single-photon pulses with time-frequency encoding.
- High-efficiency quantum memory implementation.

## Abstract

A one-dimensional atom -- an atomic system coupled to a single optical mode -- is central for many applications in optical quantum technologies. Here we introduce an effective one-dimensional atom consisting of two interacting quantum emitters coupled to a cavity mode. The dipole-dipole interaction and cavity coupling gives rise to optical resonances of tunable bandwidth with a constant mode coupling. Such versatility, combined with a dynamical control of the system, opens the way to many applications. It can be used to generate single photon light pulses with continuous variable encoding in the time-frequency domain and light states that show sub-Planck features. It can also be exploited to develop a versatile quantum memory of tunable bandwidth, another key ingredient for quantum networks. Our scheme ensures that all above functionalities can be obtained at record high efficiencies. We discuss practical implementation in the most advanced platform for quantum light generation, namely the semiconductor quantum dot system where all the technological tools are in place to bring these new concepts to reality.