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arXiv quant-ph/9808036quant-phcond-mat
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量子点阵列中的亚退相干信息编码

Subdecoherent Information Encoding in a Quantum-Dot Array

Paolo Zanardi, Fausto Rossi

摘要:

研究了半导体纳米结构中量子信息方案的潜在实现。为此,回顾了避免错误的量子编码的形式理论,并讨论了模型系统的无噪声态的存在性。基于这个理论框架,我们分析了在实际半导体结构中设计无噪声量子码的可能性。在所考虑的具体实现中,信息被编码在量子点的线性阵列的电荷激发的最低能量扇区中。我们发现,除了已知的声子瓶颈外,降低单量子比特的退相干,适当的多量子比特初始制备以及寄存器设计可以使退相干时间提高几个数量级.这种行为源于物理参数相关区域中声子环境的有效一维特征。

英文摘要:

A potential implementation of quantum-information schemes in semiconductor nanostructures is studied. To this end, the formal theory of quantum encoding for avoiding errors is recalled and the existence of noiseless states for model systems is discussed. Based on this theoretical framework, we analyze the possibility of designing noiseless quantum codes in realistic semiconductor structures. In the specific implementation considered, information is encoded in the lowest energy sector of charge excitations of a linear array of quantum dots. The decoherence channel considered is electron-phonon coupling We show that besides the well-known phonon bottleneck, reducing single-qubit decoherence, suitable many-qubit initial preparation as well as register design may enhance the decoherence time by several orders of magnitude. This behaviour stems from the effective one-dimensional character of the phononic environment in the relevant region of physical parameters.

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