NaokiAritomi - 18:20, Saturday 29 February 2020 (2059)
Shot noise and squeezing with additional faraday
[Aritomi, Yuhang, Eleonora]
We measured shot noise and squeezing with additional faraday before homodyne to reduce back scattering (attached picture).
Difference between black and blue is back scattering with faraday which is much smaller than before. Difference between blue and red curve might be effect of CC.
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Note that back scattering on Saturday was particulary bad. It seemed the mirrors were more excited than usual.
By the way I remember that before Christmas, whitout the additional Faraday, we managed to measure less then 2 dB above shot noise at 30 Hz. See here.