A proposed two-QFP superconducting circuit, Degenerium, is claimed to host protected degenerate ground states with predicted T1=1.25 s and T2=90 μs, but the fabrication-insensitivity claim and the reported times are not supported by the paper's own analysis.
Wang, Quantum computation and quantum informa- tion, Journal of Statistical Planning and Inference142, 3 (2012)
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Protected Symmetrical Superconducting Qubit Based on Quantum Flux Parametron
A proposed two-QFP superconducting circuit, Degenerium, is claimed to host protected degenerate ground states with predicted T1=1.25 s and T2=90 μs, but the fabrication-insensitivity claim and the reported times are not supported by the paper's own analysis.