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arXiv 1105.0071quant-phcond-mat.mes-hall
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自旋耦合分布对理想量子态转移的鲁棒性

Robustness of spin-coupling distributions for perfect quantum state transfer

Analia Zwick, Gonzalo A. Alvarez, Joachim Stolze, Omar Osenda

摘要:

量子信息在量子计算机的不同部分之间的传输是至关重要的。自旋链被认为是传递信息的量子信道。为了优化转移,提出了不同的自旋耦合结构。由于在创建这些特定的自旋耦合分布中的缺陷永远无法完全避免,因此通过评估其对缺陷或干扰的鲁棒性来找出哪些系统最适合于信息传输是很重要的。我们分析了为实现理想量子态转移而设计的自旋链通道的不同自旋耦合分布。特别地,我们研究了初始状态从链的一端到另一端的转移。我们量化了不同的耦合分布对扰动的鲁棒性,我们将其与能量本征态和本征值的属性。我们发现系统的局域化性质对量子态的鲁棒转移起着重要的作用。

英文摘要:

The transmission of quantum information between different parts of a quantum computer is of fundamental importance. Spin chains have been proposed as quantum channels for transferring information. Different configurations for the spin couplings were proposed in order to optimize the transfer. As imperfections in the creation of these specific spin-coupling distributions can never be completely avoided, it is important to find out which systems are optimally suited for information transfer by assessing their robustness against imperfections or disturbances. We analyze different spin coupling distributions of spin chain channels designed for perfect quantum state transfer. In particular, we study the transfer of an initial state from one end of the chain to the other end. We quantify the robustness of different coupling distributions against perturbations and we relate it to the properties of the energy eigenstates and eigenvalues. We find that the localization properties of the systems play an important role for robust quantum state transfer.

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