Discrete and parallel frequency-bin entanglement generation from quantum frequency comb

TL;DR

This paper demonstrates the generation of large-scale discrete frequency-bin entangled states using polarization-entangled quantum frequency combs in integrated microresonators, enabling scalable quantum information processing.

Contribution

It introduces a method to produce multiple frequency-bin entangled photon pairs simultaneously from quantum frequency combs, advancing scalable quantum entanglement resources.

Findings

Successfully generated 14 pairs of polarization-entangled photons in different frequencies.

Demonstrated frequency-bin entanglement via Hong-Ou-Mandel interference with multiple pairs.

Showed potential for large-scale frequency-bin entanglement in quantum information applications.

Abstract

Photons' frequency degree of freedom is promising to realize large-scale quantum information processing. Quantum frequency combs (QFCs) generated in integrated nonlinear microresonators can produce multiple frequency modes with narrow linewidth. Here, we utilize polarization-entangled QFCs to generate discrete frequency-bin entangled states. Fourteen pairs of polarization-entangled photons with different frequencies are simultaneously transformed into frequency-bin entangled states. The characteristic of frequency-bin entanglement is demonstrated by Hong-Ou-Mandel interference, which can be performed with single or multiple frequency pairs in parallel. Our work paves the way for harnessing large-scale frequency-bin entanglement and converting between different degrees of freedom in quantum information processing.