Extended Data Fig. 3: Sensitivity spectrum of the Rydberg-atom superhet.
From: Atomic superheterodyne receiver based on microwave-dressed Rydberg spectroscopy
Measured sensitivity S as a function of relative signal frequency δs is shown for various optical readout noises (red curve), the amplifier noise of photon detector (gray curve) and the spectrum analyzer noise (black curve). These optical readout noises include 1/f noise, transit noise of atoms, and laser frequency noise. The blue line represents the QPNL sensitivity of our setup (Methods). The dashed gray line indicates δs = 150 kHz chosen in experiments in the main text. The sensitivity of our setup is limited by laser frequency noise to 55 nV cm−1 Hz−1/2.
