Researchers at Durham University have shown that they can keep quantum entanglement between molecules for a long time. Quantum entanglement is when two particles, or larger arrangements of particles like molecules, are connected so that one affects the other no matter how far apart they are. This is crucial for quantum computing technology and other advanced quantum technologies.

Until now, scientists mostly entangled atoms, but molecules are more complex with extra features like vibration and rotation, useful for advanced quantum tasks. The researchers have used “magic-wavelength optical tweezers,” which are special lasers that hold molecules in place, to create a stable setting for entanglement.

“The results highlight the remarkable control we have over individual molecules,” says research leader Simon Cornish in a Durham University press release. “Quantum entanglement is very fragile, yet we can entangle two molecules using incredibly weak interactions.”

Remarkable stability of molecular entanglement

The researchers have described the methods and results of this study in a paper published in Nature. Notably, the entanglement remained stable for a time approaching one second. This stability comes from using laser light tuned just right in the optical tweezers.

This work shows molecules could be key for future quantum tech like computers or sensors, and for understanding complex materials at the quantum level.

The entanglement was very reliable, with over 92% fidelity, meaning it was very accurate. This long-lasting molecule entanglement could make quantum sensing more precise, help simulate quantum materials, and advance quantum computing.

It could also aid in making quantum memories, which store quantum data longer for quantum networks.

This achievement marks a big step forward in using molecules for sophisticated quantum technologies. “Our work demonstrates the incredible potential of molecules as building blocks for next-generation quantum technologies,” says researcher Daniel Ruttley.

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