Task #22836

spectroscopy 2.6

Added by Silvia Zorzetti 10 months ago. Updated 9 months ago.

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Starting spectroscopy on 2.6 cav fundamental mode

737607mag.png (42.6 KB) 737607mag.png Silvia Zorzetti, 07/01/2019 10:38 AM
7376084126mag_norm.png (88.8 KB) 7376084126mag_norm.png normalized magnitude Silvia Zorzetti, 07/02/2019 10:08 AM
7376084126mag.png (76.5 KB) 7376084126mag.png Silvia Zorzetti, 07/02/2019 10:08 AM
7376136089mag.png (81.2 KB) 7376136089mag.png Silvia Zorzetti, 07/08/2019 10:06 AM
7376144200mag.png (123 KB) 7376144200mag.png Silvia Zorzetti, 07/08/2019 10:10 AM
CavityMode_20181206.JPG (85.1 KB) CavityMode_20181206.JPG Silvia Zorzetti, 07/08/2019 11:53 AM


#1 Updated by Silvia Zorzetti 9 months ago

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 9 months ago

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 9 months 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 9 months ago

Start qubit search in a range from 4GHz to 5.5GHz.

#6 Updated by Silvia Zorzetti 9 months ago

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 9 months ago

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.

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