Day 903: Coherence and Decoherence

Learning Objectives

• •**Define** and **measure** $T_1$, $T_2$, and $T_2^*$ coherence times
• •**Identify** major decoherence mechanisms in superconducting qubits
• •**Analyze** noise spectral density and its impact on coherence
• •**Explain** the role of two-level systems (TLS) in decoherence
• •**Describe** materials and fabrication improvements for longer coherence
• •**Apply** noise spectroscopy techniques to characterize qubit environments

Today's Schedule (7 hours)