Yale Quantum Limited Amplifier
Turn on the amplifier.
#2 Updated by Daniil Frolov almost 2 years ago
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Flux 3D spectrum: Y scale 0 to +200 uA, x scale 4500 to 5500 MHz. According to this plot +90 uA is required to tune Idler resonator to amplify at 5 GHz.
#5 Updated by Daniil Frolov almost 2 years ago
Achieved almost 30 dB peak gain at 4.866 GHz! Average gain is about 20 dB across 10 MHz bandwidth.
Found next parameters:
Current bias: -0.1626 mA
Pump freq: 14.0324 GHz
Pump power setting: 16.9 dBm
VNA power setting: -90 dBm
#6 Updated by Daniil Frolov almost 2 years ago
Some results from JPC noise measurement.
Spectrum analyzer resolution bandwidth = 1 Hz, Span = 0 Hz
HEMT plate temperature = 2.43 K
Mixing chamber temperature = 12.6 mK
#8 Updated by Daniil Frolov almost 2 years ago
We made additional cooldown with slightly different connection of the JPC. Its input is now connected with a superconducting cable to the 20 dBm attenuator located on the Still Flange, so the noise of the 990 mK would be aplified by the JPC.
Just finished flux sweep to determine the sweetspot. Looks like the total picture shifted significantly from the previous run.