Programmable Nonlinear Quantum Photonic Circuits

TL;DR

This paper presents programmable multi-mode nonlinear quantum photonic circuits that enable high-precision, reconfigurable nonlinear interactions at the single-photon level, advancing quantum simulation capabilities.

Contribution

It introduces a novel approach to reprogrammable nonlinear quantum photonic circuits using a tunable quantum dot in a nanophotonic waveguide, overcoming previous limitations in photon interactions.

Findings

Deterministic nonlinear interactions achieved at the single-photon level.

Reprogrammable photonic circuits demonstrated for various protocols.

Potential applications in quantum simulation of molecular dynamics.

Abstract

The lack of interactions between single photons prohibits direct nonlinear operations in quantum optical circuits, representing a central obstacle in photonic quantum technologies. Here, we demonstrate multi-mode nonlinear photonic circuits where both linear and direct nonlinear operations can be programmed with high precision at the single-photon level. Deterministic nonlinear interaction is realized with a tunable quantum dot embedded in a nanophotonic waveguide mediating interactions between individual photons within a temporal linear optical interferometer. We demonstrate the capability to reprogram the nonlinear photonic circuits and implement protocols where strong nonlinearities are required, in particular for quantum simulation of anharmonic molecular dynamics, thereby showcasing the new key functionalities enabled by our technology.