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We use a quantum sensor based on thermal Rydberg atoms to receive dataencoded in electromagnetic fields in the extreme electrically small regime,with a sensing volume over $10^7$ times smaller than the cube of the electricfield wavelength. We introduce the standard quantum limit for data capacity,and experimentally observe quantum-limited data reception for bandwidths from10~kHz up to 30~MHz. In doing this, we provide a useful alternative toclassical communication antennas, which become increasingly ineffective whenthe size of the antenna is significantly smaller than the wavelength of theelectromagnetic field.

Quantum-Limited Atomic Receiver in the Electrically Small Regime