Faithful quantum teleportation via a nanophotonic nonlinear Bell state analyzer

Physical Review Letters (2025)

 

Quantum networks rely on special measurements called Bell state measurements to share and transfer quantum information, but the usual method using linear optics works well only if the photons are identical, and it often makes errors when extra photons slip in.

A research team shows in this paper a new way to do these measurements using a tiny, specially designed optical cavity that uses nonlinear optics to filter out unwanted extra photons. This approach lets them successfully teleport quantum information even between photons with different frequencies, achieving high accuracy (94% or better) even with single photons. This method avoids the limitations of traditional approaches and helps make practical, reliable quantum networks possible.

The paper is authored by Joshua Akin, Yunlei Zhao, Paul Kwiat, Elizabeth Goldschmidt and Kejie Fang, who conducted their work at the University of Illinois Urbana-Champaign.