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arXiv quant-ph/0112168quant-ph
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非局部门的交互代价

Interaction cost of non-local gates

G. Vidal, K. Hammerer, J. I. Cirac

摘要:

我们引入了一个非本地门的交互成本,作为执行门所需的最小交互时间,以帮助快速本地幺正的过程。在量子控制和量子信息领域都感兴趣的这种成本取决于特定的相互作用,并且允许以操作上有意义的方式比较任何两个非局部门。在两量子比特系统的情况下,得到了在任意耦合哈密顿量下,任意幺正操作的相互作用代价的解析表达式。对于任何可能的交互,一个门可能比另一个门更耗时。这在非局部门的集合中定义了一个偏序结构,比较它们的非局部程度。我们分析的特点,这部分的顺序在一个区域的一组两个量子比特门。

英文摘要:

We introduce the interaction cost of a non-local gate as the minimal time of interaction required to perform the gate when assisting the process with fast local unitaries. This cost, of interest both in the areas of quantum control and quantum information, depends on the specific interaction, and allows to compare in an operationally meaningful manner any two non-local gates. In the case of a two-qubit system, an analytical expression for the interaction cost of any unitary operation given any coupling Hamiltonian is obtained. One gate may be more time-consuming than another for any possible interaction. This defines a partial order structure in the set of non-local gates, that compares their degree of non-locality. We analytically characterize this partial order in a region of the set of two-qubit gates.

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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