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Task #25087

DR1_Run9(3GHz cavity - Rigetti qubit test)

Added by Taeyoon Kim about 1 month ago. Updated 9 days ago.

Status:
New
Priority:
Normal
Assignee:
-
Start date:
10/17/2020
Due date:
% Done:

0%

Estimated time:
Duration:

Description

Initial information on DR1 Run9.

Main goal: We changed the antennas of two cavities. Both input and pickup antennas have same length.

input antenna: 27.02 mm -> 31.75 mm
pickup antenna: 31.75 mm -> 31.75 mm

Schematics are same as Run 8.
https://cdcvs.fnal.gov/redmine/projects/runs/repository/dr1_run_8/revisions/master/raw/DR1_run_8.pdf

Warm electronics and warm switches schematics is located here https://cdcvs.fnal.gov/redmine/projects/runs/repository/dr1_run_8/revisions/master/raw/DR1_run_8_warm_RF.pdf

Everything can be controlled from Labber including warm switches, but cryo switches are still controlled manually.

We have several devices installed:

1) RI-1 (TERI001) 3 GHz cavity with Rigetti qubit + eccosorb filter. Cavity is located on the side. Qubit chip label: A2-g1-b1
2) RI-2 (TERI002) 3 GHz cavity with Rigetti qubit + eccosorb filter. Cavity is located in the center. Qubit chip label: A2-b1-c1
3) Pappas' qubit + added 10 dB
more in the last attenuator. (see: https://cdcvs.fnal.gov/redmine/issues/24199 )
4) McDermott's qubit is same as last DR1_run_7.
5) Pappas' 5 GHz JPA (see: https://cdcvs.fnal.gov/redmine/issues/22808#note-18 )
6) Pappas' 3 GHz JPA
7) Lincoln Lab TWPA (see: https://cdcvs.fnal.gov/redmine/issues/22808#note-12 )

RI-1_(0dBm).png (35.7 KB) RI-1_(0dBm).png Taeyoon Kim, 10/17/2020 07:21 PM
RI-1_(-40dBm).png (36.8 KB) RI-1_(-40dBm).png Taeyoon Kim, 10/17/2020 07:23 PM
RI-2_(0dBm).png (34.9 KB) RI-2_(0dBm).png Taeyoon Kim, 10/17/2020 07:32 PM
RI-2_(-35dBm).png (35.6 KB) RI-2_(-35dBm).png Taeyoon Kim, 10/17/2020 07:33 PM
RI1(0).png (31 KB) RI1(0).png Taeyoon Kim, 10/19/2020 07:06 PM
RI1(-40).png (37.6 KB) RI1(-40).png Taeyoon Kim, 10/19/2020 07:09 PM
RI1(-80).png (39.5 KB) RI1(-80).png Taeyoon Kim, 10/19/2020 07:16 PM
RI2(0).png (31.6 KB) RI2(0).png Taeyoon Kim, 10/19/2020 07:17 PM
RI2(-40).png (37.6 KB) RI2(-40).png Taeyoon Kim, 10/19/2020 07:18 PM
RI2(-80).png (40.5 KB) RI2(-80).png Taeyoon Kim, 10/19/2020 07:19 PM
Screen Shot 2020-10-23 at 11.50.29 PM.png (494 KB) Screen Shot 2020-10-23 at 11.50.29 PM.png Taeyoon Kim, 10/23/2020 11:50 PM
Screen Shot 2020-10-23 at 11.50.44 PM.png (444 KB) Screen Shot 2020-10-23 at 11.50.44 PM.png Taeyoon Kim, 10/23/2020 11:50 PM
Pappas_3GHz.png (61.6 KB) Pappas_3GHz.png Daniil Frolov, 11/16/2020 12:29 PM

History

#1 Updated by Taeyoon Kim about 1 month ago

  • Tracker changed from Bug to Task

BBQ Simulation data

Cavity Chip label Qubit frequency Qubit anharmonicity TM010 frequency Qubit-TM010 coupling Readout frequency Qubit-readout coupling
RI-2 A2-g1-b1 4.81418 GHz 138.9750 MHz 2.9945 GHz 158.9810 kHz 6.19972 GHz 6.6646 MHz
RI-1 A2-b1-c1 3.4483 GHz 164.0468 MHz 2.9830 GHz 3.5452 MHz 6.17499 GHz 3.02749 MHz

#2 Updated by Taeyoon Kim about 1 month ago

Cavity transmission(port8, port 6) vs empty network transmission(port 14)
output port: 3 (low frequency output)

RI-1 Cavity (IF BW: 100 Hz, # of avg.: 5)

Cavity attenuation + Eccosorb filter attenuation = 96.7882 dB


Cavity attenuation + Eccosorb filter attenuation = 58.1088 dB

RI-2 Cavity (IF BW: 500 Hz, # of avg.: 2)

Cavity attenuation + Eccosorb filter attenuation = 101.5438 dB


Cavity attenuation + Eccosorb filter attenuation = 71.5471 dB

Data location:
RI-2 transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1011\RI-2_CW_TM010_longer_antenna.hdf5
RI-1 transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1012\RI-1_CW_TM010_longer_antenna.hdf5
empty transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1017\Empty_network_reference.hdf5
empty transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1017\Empty_network_reference_2.hdf5

#3 Updated by Taeyoon Kim about 1 month ago

Cavity transmission test
Cavity transmission(port8, port 6) vs empty network transmission(port 14)
output port: 3 (low frequency output)

Used same settings for all measurements
IF BW: 50 Hz
number of avg.: 2
sweep span: 10 kHz
number of points: 10k

RI-1

Cavity + Ecco. filter attenuation:
on-resonance: 64.10917 dB
off-resonance: 90.8040 dB


Cavity + Ecco. filter attenuation:
on-resonance: 37.879022 dB
off-resonance: 68.2002 dB


Cavity + Ecco. filter attenuation:
on-resonance: 13.13005 dB
off-resonance: 27.748385 dB

RI-2


Cavity + Ecco. filter attenuation:
on-resonance: 38.639995 dB
off-resonance: 88.831209 dB


Cavity + Ecco. filter attenuation:
on-resonance: 29.17232 dB
off-resonance: 68.679998 dB


Cavity + Ecco. filter attenuation:
on-resonance: 15.762697 dB
off-resonance: 28.31977 dB

Power RI-1 RI-2
0 dBm on-res.: 64.10917 dB on-res.: 38.639995 dB
off-res.: 90.8040 dB off-res: 88.831209 dB
-40 dBm on-res.: 37.879022 on-res.: 29.17232 dB
off-res.: 68.2002 dB off-res: 68.679998 dB
-80 dBm on-res.: 13.13005 dB on-res.: 15.762697 dB
off-res.: 27.748385 dB off-res: 28.31977 dB

Data location:
RI-2 transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1019\Transmisiosn_test_RI2_reson_2.hdf5
RI-1 transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1019\Transmisiosn_test_RI1_reson_2.hdf5
empty transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1019\Transmisiosn_test_empty_RI1_reson.hdf5
empty transmission: D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1019\Transmisiosn_test_empty_RI2_reson.hdf5

#4 Updated by Taeyoon Kim about 1 month ago

Cross-Kerr effect?


D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1022\RI-1_CW_TM010_dispersive_shift_wide_range.hdf5


D:\redmine\runs\DR1_run_7\Labber\Data\2020\10\Data_1023\RI-1_CW_TM010_dispersive_shift_ge_3.hdf5

Cavity: RI-1
Readout mode: TM010
CW measurement with CW qubit drive

Measured dispersive shift-like shift(~300 Hz). But it turned out that the shifts occur at cavity mode, not at qubit mode(This was confirmed by measuring peaks with VNA without qubit drive).
This could be the cross-Kerr effect between cavity modes. (qubit mediates cavity-cavity interaction)
Cross-Kerr shift is very small(~200 Hz) because cavity mode inherits very small anharmonicity from the qubit, so cavity-cavity coupling is small whereas qubit-cavity coupling is relatively big(100kHz-MHz).

If this is truly cross-Kerr effect, it means qubit is alive and it was already in the low-power regime from the beginning.

Will do more scanning through the weekend to see qubit mode.

#5 Updated by Taeyoon Kim 30 days ago

  • Private changed from No to Yes

List of RI-1 cavity modes at 7-8 GHz

These are all measured with VNA at power -20 dBm and 0 dBm

7.063609566 GHz
7.064449474 GHz
7.184211502 GHz
7.397523311 GHz
7.399844343 GHz
7.601104091 GHz
7.63045704 GHz
7.656426794 GHz
7.685847298 GHz
7.691494555 GHz
7.825142061 GHz
7.829159502 GHz
7.830613116 GHz
7.983 GHz

#6 Updated by Taeyoon Kim 29 days ago

  • Private changed from Yes to No

#7 Updated by Daniil Frolov 9 days ago

Tuned 3 GHz JPA From Pappas. Gain is +16 dB.
bias: 822 uA
Pump 2.999GHz; -19.93 dBm

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