A paper has solved a major hurdle facing researchers working with diamond by creating a novel way of bonding diamonds directly to materials that integrate easily with either quantum or conventional electronics.
With this technique, the team directly bonded diamond with materials including silicon, fused silica, sapphire, thermal oxide, and lithium niobate without an intermediary substance to act as 'glue.' Instead of the several-hundred microns thick bulk diamonds typically used to study quantum qubits, the team bonded crystalline membranes as thin as 100 nanometers while still maintaining a spin coherence suitable for advanced quantum applications.
"We make a surface treatment to the diamond and carrier substrates that makes them very attractive to each other. And by ensuring we have a pristine surface roughness, the two very flat surfaces will be bonded together," said first author Xinghan Guo, who earned his PhD from UChicago PME in the spring."An annealing process enhances the bond and makes it really strong. That's why our diamond can survive various nanofabrication processes.
However, as thin diamond membranes were previously difficult to integrate directly into devices, this required larger -- but still microscopic -- chunks of the material. Paper co-author Avery Linder, a UChicago Engineering fourth-year, compared building sensitive quantum devices from these diamonds to trying to make a single grilled cheese sandwich with an entire block of cheddar.
"You can almost think of it as like a sticky surface, because it wants to be attached to something else," Linder said."And so basically, what we've done is create sticky surfaces and put them together."
Physics Quantum Physics Chemistry Quantum Computers Spintronics Research Computers And Internet Encryption
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