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arXiv 0902.0471quant-ph
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Grover搜索算法在少量子比特Ising核自旋链量子计算机中的静态和随机误差模拟

Simulation of static and random errors on Grover's search algorithm implemented in a Ising nuclear spin chain quantum computer with few qubits

T. Gorin, L. Lara, G. V. Lopez

摘要:

我们认为格罗弗的搜索算法的模型量子计算机上实现的链上的四个或五个核自旋与第一和第二邻居伊辛相互作用。根据外部场的随机波动,噪声被引入到系统中。通过对算法的多次重复求平均,输出状态实际上变成混合状态。我们研究它与算法的标称输出状态的重叠,这被称为保真度。我们发现作为噪声强度的函数的保真度的指数或高斯衰减,这取决于噪声的类型(静态或随机)以及是否应用误差抑制(2pi k方法)。

英文摘要:

We consider Grover's search algorithm on a model quantum computer implemented on a chain of four or five nuclear spins with first and second neighbour Ising interactions. Noise is introduced into the system in terms of random fluctuations of the external fields. By averaging over many repetitions of the algorithm, the output state becomes effectively a mixed state. We study its overlap with the nominal output state of the algorithm, which is called fidelity. We find either an exponential or a Gaussian decay for the fidelity as a function of the strength of the noise, depending on the type of noise (static or random) and whether error supression is applied (the 2pi k-method) or not.

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