Quantum pathology of static internal imperfections in flawed quantum computers

Details Quantum pathology of static internal imperfections in flawed quantum computers Quantum pathology of static internal imperfections in flawed quantum computers

2007-05-28

arxiv.org/abs/0705.4017v1

Physics Letters A, Volume 370, Issues 3-4, 22 October 2007, Pages 207-212

Physics

Quantum Physics

Scientific paper

10.1016/j.physleta.2007.05.074

Even in the absence of external influences the operability of a quantum computer (QC) is not guaranteed because of the effects of residual one- and two-body imperfections. Here we investigate how these internal flaws affect the performance of a quantum controlled-NOT (CNOT) gate in an isolated flawed QC. First we find that the performance of the CNOT gate is considerably better when the two-body imperfections are strong. Secondly, we find that the largest source of error is due to a coherent shift rather than decoherence or dissipation. Our results suggest that the problem of internal imperfections should be given much more attention in designing scalable QC architectures.

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