Photon Pair Generation with Tailored Frequency Correlations in Graded-Index Multimode Optical Fibers

TL;DR

This paper theoretically demonstrates how graded-index multimode optical fibers can generate photon pairs with controllable spectral correlations, enabling tunable, quantum-state-preserving sources for quantum information applications.

Contribution

It introduces a method to generate factorable and correlated photon pairs in GIMFs with preserved quantum correlations over a broad spectral range.

Findings

GIMFs can produce tunable photon pairs with controlled spectral correlations.

Factorable two-photon states enable heralded pure single-photon generation.

Simultaneous generation of correlated and uncorrelated pairs is possible in the same fiber.

Abstract

We study theoretically the generation of photon pairs with controlled spectral correlations via the four-wave mixing (FWM) process in graded-index multimode optical fibers (GIMFs). We show that the quantum correlations of the generated photons in GIMFs can be preserved over a wide spectral range for a tunable pump source. Therefore, GIMFs can be utilized as quantum-state-preserving tunable sources of photons. In particular, we have shown that it is possible to generate factorable two-photon states, which allow for heralding of single-photon pure-state photons without the need for spectral post filtering. We also elaborate on the possibility of simultaneously generating correlated and uncorrelated photon pairs in the same optical fiber.