MIT News  June 21, 2022 Quantum sensors can only detect signal fields with frequency in a few accessible ranges, typically low frequencies up to the experimentally achievable control field amplitudes and a narrow window around the sensors’ resonance frequency. A team of researchers in the US (M IT, MIT Lincoln Laboratory) devised a new system, they call a quantum mixer which 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 which is tuned to the specific frequency that the detector is most sensitive to. […]