Quantum Platform N_gates Comparison

N_gates = T₂ / t_gate — figure of merit for fault-tolerant quantum computing. Fault-tolerance threshold: N_gates > 10⁴.

×1.0
Slide left → faster gates → higher N_gates  (Transmon crosses 10⁴ at ×0.4)
Platforms:
Raw T₂
Dashed line = 10⁴ gates (fault-tolerance threshold)

T₂ ≤ 2T₁ Physical Limit

From the quantum master equation: decoherence time cannot exceed twice the relaxation time.

Platform T₁ T₂ T₂/T₁ OK?
Physics checks