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We investigate how robust is the modified XX spin-1/2 chain of [R. Vieira andG. Rigolin, Phys. Lett. A 382, 2586 (2018)] in transmitting entanglement whenseveral types of disorder and noise are present. First, we consider howdeviations about the optimal settings that lead to almost perfect transmissionof a maximally entangled two-qubit state affect the entanglement reaching theother side of the chain. Those deviations are modeled by static, dynamic, andfluctuating disorder. We then study how spurious or undesired interactions andexternal magnetic fields diminish the entanglement transmitted through thechain. For chains of the order of hundreds of qubits, we show for all types ofdisorder and noise here studied that the system is not appreciably affectedwhen we have weak disorder (deviations of less than 1% about the optimalsettings) and that for moderate disorder it still beats the standard andordered XX model when deployed to accomplish the same task.

Robust and efficient transport of two-qubit entanglement via disordered spin chains