  Rydberg atom,which exhibits a strong response to weak electric(E) fields,is
regarded as a promising atomic receiver to surpass sensitivity of conventional
receivers. However, its sensitivity is strongly limited by the noise coming
from both classical and quantum levels and how to enhance it significantly
remains challenging. Here we experimentally prove that the sensitivity of
Rydberg atomic receiver can be increased to 23 nV/cm/Hz1/2 by combining laser
arrays. Theoretically, we demonstrate that multiple beams illuminating on a PD
perform better than multiple PDs for laser arrays.In our experiment,10 dB SNR
enhancement is achieved by utilizing 2 * 2 probe beam arrays, compared to the
performance of a laser beam,and it can be enhanced further just by adding a
resonator. The results could offer an avenue for the design and optimization of
ultrahigh-sensitivity Rydberg atomic receivers and promote applications in
cosmology, meteorology, communication, and microwave quantum technology.
