# Two-TLSs versus three-level Fermion
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## https://en.wikipedia.org/wiki/Two-state_quantum_system
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## Fermions
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- page 9
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https://ocw.mit.edu/courses/8-06-quantum-physics-iii-spring-2016/6e02558ecf4b7af37d2cdff550fc0f71_MIT8_06S16_chap4.pdf
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# Parents
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* TLSs in Josephson junctions⏎