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arXiv quant-ph/9909058quant-ph
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消相干自由子空间上的通用容错计算

Universal Fault-Tolerant Computation on Decoherence-Free Subspaces

Dave Bacon, Julia Kempe, Daniel A. Lidar, K. B. Whaley

摘要:

提出了一种在系统希尔伯特空间的无消相干子空间(DFS)中实现普适量子计算的一般方案。该方案导致了在DFS上的通用量子计算的第一个容错实现,其具有以下性质:(i)仅需要一个和两个量子比特的相互作用,以及(ii)系统在量子门的整个实现过程中保持在DFS内。我们明确地展示了如何在“集体退相干”(量子比特置换不变系统浴耦合)下对每个逻辑量子比特编码的四量子比特DFS簇进行通用计算。我们的研究结果直接相关的一些固态量子计算机的实现,特别是那些量子逻辑是通过交换相互作用,如最近提出的自旋自旋耦合GaAs量子点阵列和Si:$^{31}$ P核自旋阵列。

英文摘要:

A general scheme to perform universal quantum computation within decoherence-free subspaces (DFSs) of a system's Hilbert space is presented. This scheme leads to the first fault-tolerant realization of universal quantum computation on DFSs with the properties that (i) only one- and two-qubit interactions are required, and (ii) the system remains within the DFS throughout the entire implementation of a quantum gate. We show explicitly how to perform universal computation on clusters of the four-qubit DFS encoding one logical qubit each under "collective decoherence" (qubit-permutation-invariant system-bath coupling). Our results have immediate relevance to a number of solid-state quantum computer implementations, in particular those in which quantum logic is implemented through exchange interactions, such as the recently proposed spin-spin coupled GaAs quantum dot arrays and the Si:$^{31}$P nuclear spin arrays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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