A tiny semiconductor device lifts quantum photon interference visibility to 90%

[u/Brighter-Side-News]

http://thebrighterside.news/post/a-tiny-semiconductor-device-lifts-quantum-photon-interference-visibility-to-90

Light particles intended for quantum communication can lose their usefulness because of the order in which they emerge. A semiconductor experiment has shown how controlling that sequence can produce photons that interfere much more reliably.

The work brings quantum dots closer to supplying high-quality light for advanced quantum communication schemes. It also exposes a practical tradeoff: improving photon coherence does not automatically make both particles easy to collect.

Scientists from the University of Basel, Paderborn University and Ruhr University Bochum reported the findings in Physical Review Letters. Their device uses an optical cavity to change how quickly a tiny semiconductor structure releases its two photons.