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Quantum computers based on silicon are promising candidates for long termuniversal quantum computation due to the long coherence times of electron andnuclear spin states. Furthermore, the continuous progress of micro- and nano-electronics, also related to the scaling of Metal-Oxide-Semiconductor (MOS)systems, makes possible to control the displacement of single dopants thussuggesting their exploitation as qubit holders. Flip-flop qubit is a donorbased qubit (DQ) where interactions between qubits are achievable for distanceup to several hundred nanometers. In this work, a linear array of flip-flopqubits is considered and the unwanted mutual qubit interactions due to thesimultaneous application of two one-qubit and two two-qubit gates are includedin the quantum gate simulations. In particular, by studying the parallelexecution of couples of one-qubit gates, namely Rz(-pi/2) and Rx(-pi/2), and ofcouples of two-qubit gate, i.e. \sqrt{iSWAP}, a safe inter-qubit distance isfound where unwanted qubit interactions are negligible thus leading to parallelgates fidelity up to 99.9%.

Parallel Gate Operations Fidelity in a Linear Array of Flip-Flop Qubits