Scientists at MIT have developed a method to enable such quantum sensors to detect any arbitrary frequency, with no loss of their ability to measure nanometer-scale features.engineers expand the capabilities of these ultrasensitive nanoscale detectors, with potential uses for biological sensing andWith the ability to detect the most minute variations in magnetic or electrical fields, quantum sensors have enabled precision measurements in materials science and fundamental physics.
The new system the team devised, which they call a quantum mixer, injects a second frequency into the detector using a beam of microwaves. This converts the frequency of the field being studied into a different frequency — the difference between the original frequency and that of the added signal — which is tuned to the specific frequency that the detector is most sensitive to.
Wang says that this system could be used, for example, to characterize in detail the performance of a microwave antenna. “It can characterize the distribution of the field [generated by the antenna] with nanoscale resolution, so it’s very promising in that direction,” he says.
Even the brainwaves of politicians?
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