Here, we present the low-phase-noise microwave source that we use for our entanglement enhanched interferometry sequences.
It features two independently controllable output paths for frequencies in the range of 6.835 GHz ± 25 MHz for hyperfine transitions in 87Rb. We demonstrate a low integrated phase noise of 480 µrad in the range of 10 Hz to 100 kHz and fast updates of frequency, amplitude, and phase in sub-µs time scales. The highly dynamic control enables the generation of shaped pulse forms and the deployment of composite pulses to suppress the influence of various noise sources.
You can find the article here: https://doi.org/10.1063/5.0160367
