receiving one or more polarized radio signals transmitted from a second communication node included in the communication system through one or more receive polarized antennas included in the first communication node;

performing a receive polarized antenna alignment state adjustment operation so that a detection result for a magnitude of an electric field excited by the one or more polarized radio signals is maximized; and

receiving a first polarized signal transmitted from the second communication node through at least part of the one or more receive polarized antennas based on a result of the receive polarized antenna alignment state adjustment operation,

wherein the performing of the receive polarized antenna alignment state adjustment operation comprises:

passing an electric field excited by the one or more polarized radio signals through a rubidium vapor cell in a Rydberg electromagnetically induced transparency (EIT) state, the rubidium vapor cell being included in the first communication node; and

detecting the magnitude of the electric field based on a degree in which an EIT signal is separated in the rubidium vapor cell.