Task #22836
spectroscopy 2.6
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Description
Starting spectroscopy on 2.6 cav fundamental mode
History
#1 Updated by Silvia Zorzetti almost 2 years ago
- File 737607mag.png 737607mag.png added
Spectroscopy done, found 2 peaks, 2.590817GHz, 2.5910375GHz. Running a finer sweep around both peaks. Also, it has to be noticed that at "high" power, about 25dBm from the generator the cavity and qubit look already dispersively coupled.
#2 Updated by Silvia Zorzetti almost 2 years ago
- File 7376084126mag.png 7376084126mag.png added
- File 7376084126mag_norm.png 7376084126mag_norm.png added
Dispersive shift about +135Hz. However it is difficult to compute as at higher power the cavity is already in dispersive regime.
Delta=Omega_r-Omega_q>0 -> Omega_r>Omega_q.
I find unlucky that the qubit frequency is lower than the cavity. Investigating this issue.
#3 Updated by Silvia Zorzetti almost 2 years ago
Running spectroscopy on the second harmonic, around 4.7GHz. Expect a dispersive shift of about 2kHz.
For Daniil, I am using the black SA, as we agreed yesterday. I will use the generato GPIB-19 for qubit spectroscopy.
#4 Updated by Silvia Zorzetti almost 2 years ago
Start qubit search in a range from 4GHz to 5.5GHz.
#5 Updated by Silvia Zorzetti almost 2 years ago
- File 7376136089mag.png 7376136089mag.png added
#6 Updated by Silvia Zorzetti almost 2 years ago
- File 7376144200mag.png 7376144200mag.png added
Found a frequency around 5.6 GHz. However I remember this value could be a mode of the flange. I am working on this frequency range
#7 Updated by Silvia Zorzetti almost 2 years ago
- File CavityMode_20181206.JPG CavityMode_20181206.JPG added
I checked the last measurement data (December 2018). There is a mode at the flange at 5.7GHz. This gives confidence that the 5.602GHz found now is instead qubit mode. I am working on this.
See the attached file from the run on December.