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arXiv quant-ph/9810063quant-phcond-mat
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量子计算机上的平衡问题和关联函数的计算

The problem of equilibration and the computation of correlation functions on a quantum computer

Barbara M. Terhal, David P. DiVincenzo

摘要:

我们解决的问题,如何量子计算机可以用来模拟实验的量子系统在热平衡。本文提出了在量子计算机上制备平衡态的两种方法。对于这两种方法,我们表明,算法的输出状态,经过足够长的时间,是所需的平衡。我们提出了一个数值分析的小系统,这些方法之一。我们展示了如何平衡(时间)-关联函数可以有效地估计在量子计算机上,给定的平衡态的准备。我们提出的量子算法很难在经典计算机上模拟。这表明它们可以提供比经典设备所能实现的指数加速。

英文摘要:

We address the question of how a quantum computer can be used to simulate experiments on quantum systems in thermal equilibrium. We present two approaches for the preparation of the equilibrium state on a quantum computer. For both approaches, we show that the output state of the algorithm, after long enough time, is the desired equilibrium. We present a numerical analysis of one of these approaches for small systems. We show how equilibrium (time)-correlation functions can be efficiently estimated on a quantum computer, given a preparation of the equilibrium state. The quantum algorithms that we present are hard to simulate on a classical computer. This indicates that they could provide an exponential speedup over what can be achieved with a classical device.

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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