Making light of CsPbBr3 - precisely enough to be "unsplit"

[.Scott]

TL;DR Summary

A colloidal dispersion ofCsPbBr3 deposited onto a glass surface provides a device able to emit super-precise photons able to pass the Hong-Ou-Mandel beam un-splitter test ... and perhaps form the basis for a quantum computer.

A perovskite, normally used for solar energy collection, may find an application in quantum computing.
The article is article is published in Nature (with a paywall),
It is also covered in SciTech Daily.

This is not the first material that has been able to generate photons so precisely consistent that two photons can be consistently combined by passing through a beam splitter "backwards", but the manufacturing procedure for creating these photon emitters is, itself, readily reproducible.

Once such emitters are created, they can be used to perform qubit operations in the optical domain.

 

[Adrmay]

This is a key development, as it allows for the rapid scaling of quantum computing operations by creating multiple photon emitters in parallel.The combination of the perovskite's ability to generate photons with such consistency and the ease of manufacturing them could lead to a revolution in quantum computing. The high speed and power efficiency of these devices could be invaluable in the development of powerful quantum computers.In addition to the potential use in quantum computing, perovskites are also being explored for use in next-generation solar cells. It is conceivable that these materials could be used to capture solar energy with greater efficiency than traditional silicon-based solar cells, meaning that more energy could be harvested in less time and at a lower cost.