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We show, theoretically and experimentally, how the absolute orientation andpolarization state of radio-frequency (RF) magnetic fields in a transverse 2Dplane can be uniquely determined using two optically pumped atomicmagnetometers. In addition, the output signals from these quantum sensors canbe readily expressed as a magnetic Jones vector. This composite device cancomplement electric field detection in finding RF directions, or it can be usedin applications where the electric field is negligible. The latter is found ina myriad of applications where the source can be modeled as radiating magneticdipoles in the near-field limit. This new tool could be used to characterize amaterial's response to RF excitation or to distinguish signal from noise.

Magnetic Jones Vector Detection with RF Atomic Magnetometers