Realization of Quantum enhanced Microwave ranging by University of Science and Technology of China

Thanks to CTOnews.com netizen grass Luo Yuzi for the clue delivery! CTOnews.com March 19 news, radar positioning technology based on microwave signal measurement has been widely used in autopilot, intelligent production, health detection, geological exploration and other activities. According to the official website of the University of Science and Technology of China, the team of Academician Guo Guangcan and Professor Sun Fangyan of the University of Science and Technology of China have made important progress in practical quantum sensing.

The research group uses micro-nano quantum sensing and local enhancement of electromagnetic field at deep sub-wavelength to study microwave signal detection and radio ranging to achieve 10-4 wavelength precision positioning. The results were published in the internationally renowned journal Nature Communications on March 9 (link to CTOnews.com postscript DOI).

Compared with the traditional radar system, this quantum measurement method does not need the amplifier and other active devices at the detection end, and reduces the influence of electronic noise and other factors on the measurement limit. Through the follow-up research, we can further improve the radio positioning accuracy and sampling rate based on solid-state spin quantum sensing, and develop practical solid-state quantum radar positioning technology, which exceeds the performance level of the existing radar.

▲ is based on the RF signal detection and ranging schematic diagram of the solid-state spin quantum system. Officials say that Sun Fangwang's research team has developed a charge state depletion nano-imaging method to realize super-diffraction limit resolution electromagnetic field vector sensing and imaging based on diamond nitrogen-vacancy color center. Super-resolution quantum sensing is used to explore the phenomenon of local enhancement of electromagnetic field in 10-6 wavelength space.

According to reports, this method converts the detection of weak signals in free space into the detection of the interaction between electromagnetic fields and solid-state spins in nanometer scale, which improves the microwave signal measurement sensitivity of solid-state quantum sensors by 3-4 orders of magnitude.

In order to further use high-sensitive microwave detection to achieve high-precision microwave positioning, the research team built a microwave interference measurement device based on diamond quantum sensor. Through solid-state spin detection of the interference between the microwave signal reflected by the object and the reference signal, the phase of the microwave signal reflected by the object and the position information of the object are obtained. At the same time, the research team realized the position measurement accuracy of quantum enhancement by using the multiple coherent interaction between solid-state spin quantum probe and microwave photons, reaching the level of 10 microns (about 1/10000 of the wavelength).