Quantum pathology of static internal imperfections in flawed quantum computers

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• 作者：Murat Ç ; etinbaş ; ; Joshua Wilkie
• 关键词：Decoherence ; Coherent shift ; Lamb shift ; Chaotic baths ; Fidelity
• 刊名：Physics Letters A
• 出版年：2007
• 出版时间：22 October 2007
• 年：2007
• 卷：370
• 期：3-4
• 页码：207-212
• 全文大小：545 K

文摘

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.