# Coherence and indistinguishability of highly pure single photons from non-resonantly and resonantly excited telecom C-band quantum dots

## TL;DR

This paper investigates how resonant pumping improves the coherence and indistinguishability of single photons emitted by quantum dots in the telecom C-band, advancing quantum communication technologies.

## Contribution

It demonstrates enhanced photon coherence and indistinguishability using resonant excitation schemes in telecom-band quantum dots, with potential applications in quantum communication.

## Key findings

- Resonant excitation reduces linewidth from 9.74 GHz to 3.50 GHz.
- Achieved 49.2% fidelity in coherent state preparation.
- Measured g^{(2)}(0)=0.072 and HOM visibility=0.894 for biexciton photons.

## Abstract

In the present work, the effect of resonant pumping schemes in improving the photon coherence is investigated on InAs/InGaAs/GaAs quantum dots emitting in the telecom C-band. The linewidths of transitions of multiple exemplary quantum dots are determined under above-band pumping and resonance fluorescence via Fourier-transform spectroscopy and resonance scans, respectively. The average linewidth is reduced from $9.74\,\mathrm{GHz}$ in above-band excitation to $3.50\,\mathrm{GHz}$ in resonance fluorescence underlining its superior coherence properties. Furthermore, the feasibility of coherent state preparation with a fidelity of $49.2\,\%$ is demonstrated, constituting a step towards on-demand generation of coherent, single C-band photons from quantum dots. Finally, two-photon excitation of the biexciton is investigated as a resonant pumping scheme. A deconvoluted single-photon purity value of $g^{(2)}_{\mathrm{HBT}}(0)=0.072\pm 0.104$ and a degree of indistinguishability of $V_{\mathrm{HOM}}=0.894\pm0.109$ are determined for the biexciton transition. This represents an important step towards fulfilling the prerequisites for quantum communication applications like quantum repeater schemes at telecom wavelength.