# Nonlinear nanophotonics for high-dimensional quantum states

## TL;DR

This paper explores using nanophotonics to create high-dimensional quantum states, advancing on-chip quantum technologies.

## Contribution

A novel method for generating qudits via nonlinear nanophotonic processes using pump field polarization.

## Key findings

- Nonlinear nanophotonics can selectively create high-dimensional quantum states.
- Pump field polarization controls angular momentum modes and their superpositions.
- This approach enables compact and efficient quantum state manipulation on chips.

## Abstract

Quantum nanophotonics merges the precision of nanoscale light manipulation with the capabilities of quantum technologies, offering a pathway for enhanced light-matter interaction and compact realization of quantum devices. Here, we show how a recently-demonstrated nonlinear nanophotonic process can be employed to selectively create photonic high-dimensional quantum states (qudits). We utilize the nonlinearity on the surface of the nanophotonic device to dress, through the polarization of the pump field, the near-field modes carrying angular momentum and their superpositions. This idea is an important step towards experimental realizations of quantum state generation and manipulation through nonlinearity within nanophotonic platforms, and enables new capabilities for on-chip quantum devices.