# Reconfigurable frequency coding of triggered single photons in the telecom C--band

## TL;DR

This paper demonstrates reconfigurable frequency encoding of single photons in the telecom C-band using phase modulation, preserving quantum properties for potential integration into existing fiber networks.

## Contribution

It introduces a method to manipulate quantum states of light in the telecom band with reconfigurable frequency channels using standard phase modulators.

## Key findings

- Successful encoding of single photons in multiple frequency channels.
- Preservation of single photon quantum properties after modulation.
- Compatibility with existing telecom fiber infrastructure.

## Abstract

In this work, we demonstrate reconfigurable frequency manipulation of quantum states of light in the telecom C-band. Triggered single photons are encoded in a superposition state of three channels using sidebands up to 53 GHz created by an off-the-shelf phase modulator. The single photons are emitted by an InAs/GaAs quantum dot grown by metal-organic vapor-phase epitaxy within the transparency window of the backbone fiber optical network. A cross-correlation measurement of the sidebands demonstrates the preservation of the single photon nature; an important prerequisite for future quantum technology applications using the existing telecommunication fiber network.