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Lisenfeld, Towards understanding two-level-systems in amorphous solids: insights from quantum circuits, Reports on Progress in Physics, 2019","review_link":"https://doi.org/10.1088/1361-6633/ab3a7e","review_verified":"true","summary":"Quantum bits built from superconducting circuits or single electron spins lose their information to tiny defects in nearby materials and to stray broken electron pairs. Which atoms and processes are responsible, and how to remove them, is not known in detail.","title":"Material sources of decoherence in solid-state qubits","topic_ref":null,"why":"These material defects now set the coherence limit of superconducting quantum 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