Microwave technology is used in a wide range of scientific and technological fields, including telecommunications, astronomy, navigation and air traffic control and medical diagnostics. The EU-funded QuMicro project plans to develop ultrasensitive sensors that can detect microwaves with unprecedented sensitivity. The new platform for detecting microwave signals at room temperature will use nitrogen-vacancy centres in diamond. If researchers succeed, the proposed sensor will be able to measure the frequency, amplitude and phase of microwave fields over extremely fast time scales. QuMicro’s system could draw attention as an enabling technology for commercialising next-generation technologies, including quantum computers.