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Year 2·Month 30·Week 4

Day 834: Google Willow Architecture

Day 834 of 2,016~19 min read

Learning Objectives

•**Describe Willow's qubit layout** - Explain the 105-qubit arrangement for d=3,5,7 surface codes
•**Analyze transmon design choices** - Understand frequency allocation and coherence optimization
•**Explain tunable coupler operation** - Detail the flux-tunable coupler mechanism for two-qubit gates
•**Evaluate connectivity patterns** - Assess how the grid connectivity enables surface code operation
•**Quantify gate performance** - Interpret single and two-qubit gate fidelities achieved
•**Compare with predecessor systems** - Contrast Willow with Sycamore (2019) and Weber (2021)

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