[Aritomi, Eleonora P., Matteo]

 

Since we don't have good squeezing, we checked visibility. 

Measured visibility is max: 8.2V, min: 4.36V, which is 0.306. Measured power is LO: 1.16mW, BAB: 110uW. Visibility is 0.563.

So the visibility is bad.

 

We checked the alignment of LO and BAB to AMC and found alignment of LO is quite bad. We aligned LO and BAB to AMC. 

For LO, peak: 7.84V, mismatch: 8mV+4.8mV. Mode matching is 99.9%. 

For BAB, peak: 560mV, mismatch: 23.2 mV+2mV. Mode matching is 95.7%.

 

Then we measured visibility.

Measured visibility is max: 624mV, min: 200mV, which is 0.515. Measured power is LO:1.2mW, BAB: 98uW. Visibility is 0.528. Mode matching is 97.5.

 

Parametric gain

BAB without green: 34mV, parametric amp: 648mV

Parametric gain: 19.1

p pol PLL: 176MHz

 

Attached figure shows measured squeezing, but the situation is same as before.

 

Problem: When we tried to average shot noise level in a spectrum analyzer, the shot noise level changed (decreased).

Since we don't have good squeezing, we checked visibility. 

Measured visibility is max: 8.2V, min: 4.36V, which is 0.306.

Measured power is LO: 1.16mW, BAB: 110uW. Visibility is 0.563.