In a study published in Physical Review Applied on December 20, 2024, the team demonstrated that pairs of grapes generate localized magnetic field hotspots of microwaves, crucial for quantum sensing. This breakthrough could lead to smaller, cost-effective quantum devices.
"While previous studies looked at the electrical fields causing the plasma effect, we showed that grape pairs can also enhance magnetic fields, which are crucial for quantum sensing applications," said lead author Ali Fawaz, a quantum physics PhD candidate at Macquarie University.
Inspired by viral videos showing grapes creating plasma in microwave ovens, the team shifted focus to magnetic fields and their role in quantum applications.
Using nanodiamonds containing nitrogen-vacancy centers - atomic-scale defects that act as quantum sensors - the researchers explored the magnetic field effects. These defects serve as tiny magnets capable of detecting magnetic fields.
"Pure diamonds are colorless, but when certain atoms replace carbon atoms, they form 'defect' centers with unique optical properties," explained Dr. Sarath Raman Nair, co-author and lecturer in quantum technology at Macquarie University.
The researchers positioned a diamond quantum sensor on the tip of a glass fiber between two grapes. Green laser light shone through the fiber caused the atoms to glow red, and the brightness indicated the strength of the microwave field.
"Using this technique, we found the magnetic field of the microwave radiation becomes twice as strong when we add the grapes," Fawaz noted.
Professor Thomas Volz, senior author and head of the Quantum Materials and Applications Group at Macquarie University, highlighted the significance of these findings for quantum technology development.
"This research opens up another avenue for exploring alternative microwave resonator designs for quantum technologies, potentially leading to more compact and efficient quantum sensing devices," Volz stated.
The team used precisely sized grapes, each approximately 27 millimeters long, to ensure optimal microwave concentration for the diamond quantum sensor. Unlike traditional sapphire-based systems, the team theorized that water, a key component of grapes, could outperform sapphire in concentrating microwave energy, despite challenges like energy loss and stability.
"Water is actually better than sapphire at concentrating microwave energy, but it's also less stable and loses more energy in the process. That's our key challenge to solve," added Fawaz.
Future research will focus on developing stable materials that leverage water's properties, moving closer to more efficient quantum sensing devices.
The work was supported by the Australian Research Council Centre of Excellence for Engineered Quantum Systems.
Research Report:Coupling nitrogen-vacancy center spins in diamond to a grape dimer
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