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arXiv quant-ph/0512238quant-ph
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指数精度量子态的高效制备

Efficient Preparation of Quantum States With Exponential Precision

Peter Jaksch

摘要:

事实证明,从国家|0>,在一般情况下,任意量子态|不能在多项式时间内以指数精度准备。然而,我们表明,对于重要的特殊情况,当|表示某个实连续函数的离散值,通过将本征值估计算法应用于具有本征态的哈密顿量,可以有效地准备。我们明确地构造了所需的哈密顿量,并提出了一种迭代算法,用于从输出态中去除不需要的叠加,以达到|在指数精度内。该方法适用于非常一般的条件,可以为量子模拟算法提供非常精确和一般的起始态。

英文摘要:

It has been shown that, starting from the state |0>, in the general case, an arbitrary quantum state |ψ> cannot be prepared with exponential precision in polynomial time. However, we show that for the important special case when |ψ> represents discrete values of some real, continuous function ψ(x), efficient preparation is possible by applying the eigenvalue estimation algorithm to a Hamiltonian which has ψ(x) as an eigenstate. We construct the required Hamiltonian explicitly and present an iterative algorithm for removing unwanted superpositions from the output state in order to reach |ψ> within exponential accuracy. The method works under very general conditions and can be used to provide the quantum simulation algorithm with very accurate and general starting states.

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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