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A quantum circuit with two Hadamard (Hd) gates and three CNOT gates for implementation of the 4-qubit QEEC code. The stabilizer generators of the QEEC code are X ⊗ X ⊗ X ⊗ X and Z ⊗ Z ⊗ Z ⊗ Z, where X(Z) is short for Pauli matrix σx (σz) (24). As proposed by Vaidman et al. (31), this 4-qubit code can also be used for error detection.
