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Task #24209

DR1_Run_7

Added by Daniil Frolov 4 months ago. Updated 3 months ago.

Status:
New
Priority:
Normal
Assignee:
-
Start date:
03/23/2020
Due date:
% Done:

0%

Estimated time:
Duration:

Description

Initial information on DR1_Run_7.

Schematics of the fridge can be found here:
https://cdcvs.fnal.gov/redmine/projects/runs/repository/revisions/master/raw/DR1_run_7/DR1_run_7.pdf

We will have 4 qubits to test:

1) RI-1 (TERI001) 3 GHz cavity with qubit, from last DR1_run_6 f=2.996106286 GHz; Q~ 1E+8; T=3.8 K (see: https://cdcvs.fnal.gov/redmine/issues/23805)

2) RI-2 (TERI002) 3 GHz cavity with qubit (we were not able to find resonance during last DR1_run_6.)

3) Pappas' qubit (see: https://cdcvs.fnal.gov/redmine/issues/24199 )

4) McDermott's qubit is same as last DR1_run_6, but flux biasing lines are now disconnected and we attached qubit to the plate with aluminum c-clamp instead of stainless steel screws.

Several RF lines are now connected to the fridge with DC-blocks (except those who run DC current), connector panels on the fridge and in the RF equipment rack are made from dielectric in attempt to prevent possible ground loops.

we also have:

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 )

warm_electronics.jpg (2.02 MB) warm_electronics.jpg Daniil Frolov, 04/02/2020 01:19 PM
IQ_down_converter.pdf (62.4 KB) IQ_down_converter.pdf Daniil Frolov, 04/02/2020 01:36 PM
teri002_shift.GIF (51 KB) teri002_shift.GIF Daniil Frolov, 04/08/2020 11:40 AM
pappas_vna_readout_scan.GIF (165 KB) pappas_vna_readout_scan.GIF Daniil Frolov, 04/08/2020 11:51 AM
pappas_vna_qubit_search.GIF (215 KB) pappas_vna_qubit_search.GIF Daniil Frolov, 04/08/2020 11:54 AM
pulsed_readout_scan.GIF (194 KB) pulsed_readout_scan.GIF Daniil Frolov, 04/08/2020 11:56 AM
pulsed_qubit_scan.GIF (203 KB) pulsed_qubit_scan.GIF Daniil Frolov, 04/08/2020 11:59 AM
pappas_rabi.GIF (219 KB) pappas_rabi.GIF Daniil Frolov, 04/08/2020 12:02 PM
pappas_t1.GIF (37.7 KB) pappas_t1.GIF Daniil Frolov, 04/08/2020 12:04 PM
pappas_t2.GIF (28.5 KB) pappas_t2.GIF Daniil Frolov, 04/08/2020 12:27 PM
pappas_t2a.GIF (49.8 KB) pappas_t2a.GIF Daniil Frolov, 04/08/2020 03:26 PM
pappas_t2echo.GIF (47.7 KB) pappas_t2echo.GIF Daniil Frolov, 04/08/2020 03:28 PM

History

#1 Updated by Daniil Frolov 3 months ago

I'm adding here schematics of warm electronics that can be controlled from Labber.

#3 Updated by Daniil Frolov 3 months ago

Summary for cavities:
we didn't find TM010 modes in the cavities. Seems that Q0 is very bad.
In TERI002 cavity we found shift in frequency at low power in 7.09902 GHz mode. Shift is 6.4 kHz

D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0403\shift_search_in_TERI002_7.099G_zoom.hdf5

Some scans included external high power amplifier when we scanned 2.5-3.5 GHz range to improve noise floor:
D:\redmine\runs\DR1_run_7\Labber\Data\2020\03\Data_0331\TM010_search_in_TERI001_poweramp_2.5-3.5.hdf5
D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0401\TM010_search_in_TERI002_poweramp_2.5-3.5.hdf5

High resolution scan of high order modes in TERI002 is here:
D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0403\shift_search_in_TERI002_6.87-8.hdf5

Other various scans of cavities TERI002 and TERI001 can be found data folders from 2020-03-27 till 2020-04-03.

Summary for Pappas' qubit:

1)Fast VNA readout freq vs power scan:


D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0405\Pappas_Chi0_PowerScan_6.481GHz_2.hdf5

2) Fast VNA qubit frequency scan vs readout power:


D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0405\Pappas_QubitSearch_5.3-5.8GHz_Pqub-20dBm_Pcav-60dBm.hdf5

3) Pulsed readout vs power scan:


D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0405\Pappas_PulsedReadout_trial.hdf5

4) Pulsed qubit scan + anharmonicity:

D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0407\Pappas_Pulsed_qubit_search_2DaysLater.hdf5
D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0405\Pappas_Pulsed_qubit_search_2.hdf5

5) Rabi oscillations.

D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0407\Pappas_Pulsed_Vq+-1000mV_L0-500ns_Gauss_Scan_2.hdf5
D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0407\Pappas_Pulsed_Vq+-1000mV_L0-500ns_Gauss_Scan.hdf5
D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0406\Pappas_Pulsed_Vq+-1000mV_L0-500ns_Gauss_Scan.hdf5

6) T1

D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0408\Pappas_T1_scan_Gauss_Scan_2_pi-puse_467mV_200ns.hdf5

7) T2

D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0408\Pappas_T2_scan_Gauss_Scan_half_pi-puse_233mV_200ns.hdf5

We tried to measure Rabi and t1 when all cables except two are disconnected from the fridge and dc-blocks on those two cables were used, but didn't notice significant difference with normal setup.

#4 Updated by Daniil Frolov 3 months ago

Some more:
8) T2 with higher resolution. Qubit de-tuning here was -1.67MHz.


D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0408\Pappas_T2_scan_Gauss_Scan_half_pi-puse_233mV_200ns_qubit_detuned by -1.67MHz.hdf5

9) T2 echo with qubit de-tuning -1.67MHz.

D:\redmine\runs\DR1_run_7\Labber\Data\2020\04\Data_0408\Pappas_T2_echo_scan_Gauss_half_pi-puse_233mV_200ns_pi_pulse_467mV_200ns_qubit_detuned by -1.67MHz.hdf5

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