DC SQUID Magnetic Flux Noise Calculator
Quantum magnetometry: Model DC Superconducting Quantum Interference Devices (SQUIDs), magnetic flux quantum modulation ($Phi_0$), flux-to-voltage transfer gain ($V_\Phi$), and thermal Nyquist flux noise ($S_\Phi^{1/2}$).
SQUID Loop & Junction Parameters
Per individual junction
External damping shunt resistor
1 pH = 10⁻¹² H (Typical: 50–150 pH)
LHe: 4.2 K; LN2: 77 K; Dilution: 0.1 K
Applied Magnetic Flux
0.25 or 0.75 Φ₀ gives maximum voltage sensitivity
SQUID Sensitivity & Noise Output
Magnetic Flux Noise S_Φ^1/2:
--
μΦ₀ / √Hz
Transfer Function V_Φ = |∂V/∂Φ|:
--
μV / Φ₀
Screening Parameter β_L = 2 L Ic / Φ₀:
--
Optimal SQUID design: β_L ≈ 1.0
Critical Current Modulation ΔI_c:
--
μA peak-to-peak depth
| Equivalent Magnetic Field Noise B_n: | -- |
| Thermal Voltage Noise S_v^1/2: | -- |
| Coupled Energy Resolution ε: | -- |
| Quantum Limit Factor (ε / ℏ): | -- |
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