Generation of multiphoton entangled quantum states by means of integrated frequency combs

TLDR

Optical frequency combs with millions of precisely spaced lines are crucial for optical applications and fundamental science, as demonstrated by Reimer et al. The study demonstrates that frequency combs can be extended into the quantum regime. Individual comb teeth were quantum‑mechanically entangled to create complex optical states. The method’s compatibility with existing fiber and semiconductor technology indicates a scalable, practical platform for quantum technologies. Published in Science, issue p.

Abstract

Entangled frequency combs The ability to generate optical frequency combs in which the output light is made up of millions of sharp lines precisely spaced apart has been important for optical applications and for fundamental science. Reimer et al. now show that frequency combs can be taken into the quantum regime. They took individual teeth of the combs and quantum-mechanically entangled them to form complex optical states. Because the method is compatible with existing fiber and semiconductor technology, the results demonstrate a possible scalable and practical platform for quantum technologies. Science , this issue p. 1176