Fig. 1: The scheme of high accuracy RF ranging with a quantum sensor.
From: Quantum enhanced radio detection and ranging with solid spins
a Conceptual setup for the radio ranging with quantum sensor. Two RF paths with the same frequency serve as the reference (RF A) and ranging signal (RF B). The ranging signal is reflected by a target with a distance of L. Then, the free space interference signal between the two paths is confined in a microscale volume and interacts with the NV center quantum sensor. b Principle of extracting the target’s distance information. The phase of the back scattered RF pulse changes with the position of the target, as φ(L). It determines the amplitude (BRF) of the interference between the backscattered and the reference RF pulses. Subsequently, the Rabi oscillation rate of quantum sensor will change with the position of target, as Ω(L). The position of target is finally estimated by measuring the electron spin of NV center ensemble in diamond.
