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Scientists discovered grapes (yes, grapes) double magnetic field strength — and it could revolutionize quantum sensing.Researchers at Macquarie University have harnessed the humble grape to double the magnetic field strength in quantum sensor setups, potentially revolutionizing compact and efficient quantum technologies. Inspired by viral experiments of grapes generating plasma in microwaves, the team demonstrated that grape pairs can act as microwave resonators, focusing magnetic energy critical for driving quantum sensors like nitrogen-vacancy centers in nanodiamonds. These diamond "defects," acting as tiny magnets, revealed the microwave field intensity through their distinctive red glow when stimulated by lasers. By positioning quantum sensors between two 27-mm-long grapes, the researchers achieved unprecedented magnetic field enhancements, paving the way for smaller, more cost-effective quantum sensing devices.Traditionally reliant on sapphire, quantum sensing could now leverage water-based alternatives, as grapes — composed mainly of water enclosed in a thin skin — proved ideal for focusing microwave energy. However, water's instability and energy losses pose challenges, prompting the researchers to seek more reliable materials that retain its unique advantages. Their findings, published in Physical Review Applied, open new avenues in designing microwave resonators and improving quantum sensing technologies. Learn more: https://www.eurekalert.org/multimedia/1054310