Quantum Computer Errors Rise As Crosstalk Noise Is Fully Modelled

Researchers at The University of Melbourne and Monash University have conducted a thorough investigation into coherent quantum crosstalk noise and its impact on surface codes, advancing the development of practical, fault-tolerant quantum computers. Ben Harper and colleagues utilised advanced hybrid stabilizer-tensor network simulations to model this previously inaccessible noise during syndrome extraction. The findings reveal that including coherence in noise models sharply increases logical error rates and lowers the code threshold, demonstrating how noise distribution alters performance. These results offer key new insights into the effects of crosstalk noise and broaden the scope of quantum error correction code simulations. Surface code logical error rates have been…