A gamma-adapted four-qubit code found by biconvex optimization outperforms the standard Leung-Nielsen-Chuang-Yamamoto code against amplitude damping, with analytical recovery achieving Fent = 1 - 1.85 gamma^2.
It is represented by the operators: A0 = 1 0 0 √1 − γ A1 = 0 √γ 0 0 (6) where γ denotes the probability of transition from the state |1⟩ to |0⟩, symbolizing the decay process
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Optimized four-qubit quantum error correcting code for amplitude damping channel
A gamma-adapted four-qubit code found by biconvex optimization outperforms the standard Leung-Nielsen-Chuang-Yamamoto code against amplitude damping, with analytical recovery achieving Fent = 1 - 1.85 gamma^2.