[Aritomi,Yuhang,Yao-chin, Eleonora]

The attached plot shows a very tentative degradation budget for the squeezing injection into FC detuned at 50 kHz (entry #1751)

PRODUCED SQUEEZING: 16 dB  (from anti squeezing measurement) (entry #1587)

TOTAL INJECTION LOSS = 33 %

- from inside OPO to 1st PBS = 18% (loss of frequency independent squeezing: 21% - visibility: 2% - quantum efficiency: 1%)

- after 1st PBS before PR chamber = 10%

- from PR viewport up to FC  = 5 %

TOTAL READOUT LOSS = 12 %

- from FC to PR viewport: 10%

- after viewport to Homodyne: 1%

- Homodyne Q. E. = 1%

MISMATCH from SQZ to FC = 10 %

MISMATCH from SQZ to HOM = 5 %

FILTER CAVITY LOSSES : 100 ppm

PHASE NOISE = 100 mrad (very tentative, when CC2 doesn't unlock)

LOCK ACCURACY = 5 pm (very tentative, to be measured)

Conclusion: it seems that the degradation is dominated by mismatching