Qubit-Coupled Mechanics - IFSC
Qubit-Coupled Mechanics - IFSC
Qubit-Coupled Mechanics - IFSC
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LC Circuit Read-out of <strong>Qubit</strong> vs. Applied B-field<br />
• LC response modulates<br />
periodically with applied<br />
magnetic field:<br />
E J ∝ cos (πΦ/Φ 0 )<br />
• Model parameters<br />
• E C = 1.3 GGG<br />
• E J = 12.7 GGG<br />
• λ/2π = 160 MMM<br />
• ω/2π = 1.945 GGG<br />
• General agreement with<br />
Jaynes-Cummings Model<br />
for qubit-coupled LC<br />
• Model Needs Improvement<br />
• Charge noise<br />
• Finite temperature<br />
LC Probe Frequency (GHz)<br />
LC Probe Frequency (GHz)<br />
1.96<br />
1.95<br />
1.94<br />
1.96<br />
1.95<br />
1.94<br />
___<br />
…….<br />
Amplitude<br />
Phase<br />
<strong>Coupled</strong> qubit & LC<br />
Uncoupled qubit &LC<br />
*fridge temperature ≲ 30 mK*<br />
-1.5 0.5 0.5 1.5<br />
Magnetic Flux (πΦ/Φ 0 )<br />
0.0<br />
-5.0<br />
-10.0<br />
1.0<br />
0.5<br />
0.0<br />
-0.5<br />
Transmission Amplitude (dB)<br />
Transmission Phase (rad.)
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