[Alex, Boris]

Boris and I ran the first GQuEST SNSPD tests this past friday!!

We ran IV curve traces to determine the switching current of the SNSPD to be about 21 uA (image 1). 

We have a nice image of the pulse seen on the oscillascope (image 2).o

Next we ran a count rate test and a dark count rate test. The two tests together gave us our output efficiency which was in the range of 85-90% currently. (image 3&4) where the input number of photons was ~29,000. 

We then ran an hour long test for the dark count with the fiber input connector terminated which I will post a more in depth graph for tomorrow.  

All seems well for the GQuEST SNSPD at this time, and we will next be opening the fridge this coming wednesday and replacing the SNSPD case for the completely dark case and rerunning our DCR tests.  

All data is in the next cloud: Nextcloud\GQuEST\SNSPD\Efficiency_testing\DATA\11102023