From 23-12-26

Yuhang, Hsien-Yi, Michael

We discussed taking data for the Taiwan group machine learning project. We would like to take a long scan of homodyne subtraction DC port while continuously scanning the homodyne angle, in order to have an appropriate time series for FIS training data. The proposition is to scan the phase of the CC2 servo, which controls the phase of the local oscillator via the infrared phase shifter, while CC2 is locked, and then leave it for some time with several periods of squeezing/antisqueezing traversal. Typically we set homodyne angle in DDS through DDS3 DAC3 CC2 Demodulation (though it's actually Channel 1 in the software). So we figured to inject a ramp signal to CC2 Perturb IN, which in principle should allow us to scan the homodyne angle. Unfortunately homodyne is demodulated using a single chanel mixer. We should buy an IQ mixer to allow us to tell if it is amplification or deamplification.