Sub-Kelvin Quantum Hardware &
Josephson Junction Coherence

An 8-second macro journey across a polished sapphire substrate inside a sub-Kelvin dilution refrigerator. Experience superconducting niobium micro-traces, Josephson junctions, and ultra-high coherence times ($T_1$/$T_2$).

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// MACRO ARCHITECTURE JOURNEY

Substrate & Junction Topology

PHASE 01 // 0.0s – 2.5s 💎 SUBSTRATE

Polished Sapphire Substrate

Ultra-pure single-crystal sapphire ($ ext{Al}_2 ext{O}_3$) wafer offering near-zero dielectric loss tangents at cryogenic temperatures.

Substrate Loss $ an\delta$: < 1 × 10⁻⁶

Reflective Index: 1.768

Base Vacuum: 10⁻⁹ mbar

PHASE 02 // 2.5s – 5.5s ⚡ MICRO-BRIDGE

Josephson Junction Niobium Traces

Superconducting Niobium ($ ext{Nb}/ ext{AlO}_x/ ext{Nb}$) micro-bridge providing non-linear inductance for quantum state manipulation.

Relaxation Time ($T_1$): 148.5 µs

Dephasing Time ($T_2$): 215.2 µs

2-Qubit Gate Fidelity: 99.94%

PHASE 03 // 5.5s – 8.0s ✨ BASE PLATE

Gold Coax Wire-Bonds & Thermal Anchor

Gold coax wire-bonds connecting the processor module to the dilution refrigerator base plate anchored at sub-15 mK temperatures.

Dilution Base Temp: 14.8 mK

Cooling Power: 450 µW @ 100mK

Readout Fidelity: 99.87%

Interactive Qubit State Simulator

Manipulate the quantum state $|\psi angle = \cos( heta/2)|0 angle + e^{i\phi}\sin( heta/2)|1 angle$ across the Josephson junction drive lines.

Theta Pulse (θ): 1.57 rad (π/2)

Phi Phase (φ): 0.00 rad