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arXiv quant-ph/0609118quant-ph
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通过测量电荷纠缠自旋:奇偶门工具箱

Entangling spins by measuring charge: a parity-gate toolbox

Radu Ionicioiu

摘要:

最近出现的奇偶校验门作为一个有前途的资源执行通用量子计算与费米子只使用线性相互作用。在这里,我们从量子网络的背景下从理论的角度分析奇偶校验门(P门)。我们提出了几种方案的纠缠产生与P门,并表明,本地网络大大简化了所需的资源,产生多量子比特纠缠,如n-GHZ状态。其他应用包括贝尔状态分析器和隐形传态。我们还表明,集群状态融合可以进行确定性的奇偶校验测量。然后,我们将这种分析扩展到包含自旋和模式量子位的混合量子网络。从一个容易准备的资源(自旋模式纠缠的单电子),我们展示了如何产生一个自旋n-GHZ状态与线性元件(分束器和本地自旋翻转)和电荷奇偶校验检测器;这种状态可以被用作自旋量子计算机中的资源或作为构建集群状态的先驱。最后,我们利用模式自由度作为辅助,构造了一种新型的自旋CZ门。

英文摘要:

The parity gate emerged recently as a promising resource for performing universal quantum computation with fermions using only linear interactions. Here we analyse the parity gate (P-gate) from a theoretical point of view in the context of quantum networks. We present several schemes for entanglement generation with P-gates and show that native networks simplify considerably the resources required for producing multi-qubit entanglement, like n-GHZ states. Other applications include a Bell-state analyser and teleportation. We also show that cluster state fusion can be performed deterministically with parity measurements. We then extend this analysis to hybrid quantum networks containing spin and mode qubits. Starting from an easy-to-prepare resource (spin-mode entanglement of single electrons) we show how to produce a spin n-GHZ state with linear elements (beam-splitters and local spin-flips) and charge-parity detectors; this state can be used as a resource in a spin quantum computer or as a precursor for constructing cluster states. Finally, we construct a novel spin CZ-gate by using the mode degrees of freedom as ancillae.

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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