Transformed composite sequences for improved qubit addressing

family. Further, we demonstrate the effectiveness of these sequences in an experiment with 40 Ca + ion qubits in a surface-electrode trap. We consider a register of N identical spatially separated qubits. A resonant laser in the rotating-wave limit illuminates an addressed qubit i, but also illuminates neighboring qubits j at a lower intensity, resulting in an addressing error. Control over the qubits is implemented by applying a time-dependent Hamiltonian

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