Day 804: The Rotated Surface Code

Learning Objectives

• •**Explain** the geometric transformation that creates the rotated surface code
• •**Derive** the qubit count reduction: $n = (d^2 + 1)/2$ for data qubits
• •**Construct** the stabilizer layout for rotated codes
• •**Compare** rotated and unrotated codes for different metrics
• •**Describe** hardware-native layouts (heavy-hex, square-octagon)
• •**Evaluate** tradeoffs between different surface code variants

Today's Schedule (7 hours)