arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1911.03335quant-ph
收藏

量子计算机上的热场动力学

Thermo field dynamics on a quantum computer

Raffaele Miceli, Michael McGuigan

摘要:

本文提出了一种在量子计算机上实现有限温度模拟的量子算法。由于量子计算机使用实时进化,我们没有使用经典算法中流行的虚时间方法。相反,我们实现了一个实时的热场动力学形式主义,它具有额外的好处,能够计算的数量都依赖于时间和温度。为了实现热场动力学,我们应用幺正变换离散量子力学算子,使新的哈密顿编码的温度依赖性。该方法通常适用于费米子,费米子具有有限表示,但需要一些修改才能与玻色子一起使用。然后将这些哈密顿量处理成泡利矩阵表示,以便用作IBM Qiskit软件包的输入。然后,我们使用IBM的量子模拟器通过变分量子本征求解器(VQE)算法计算近似的哈密顿的基态能量。然后将该近似值与精确能量的经典计算值进行比较。热场动力学量子算法在材料科学、高能物理和核物理中有广泛的应用,特别是在涉及高温实时演化的情况下。

英文摘要:

In this paper we develop a quantum algorithm to realize finite temperature simulation on a quantum computer. As quantum computers use real-time evolution we did not use the imaginary time methods popular on classical algorithms. Instead, we implemented a real-time thermo field dynamics formalism, which has the added benefit of being able to compute quantities that are both time- and temperature-dependent. To implement thermo field dynamics we apply a unitary transformation to discrete quantum mechanical operators to make new Hamiltonians with encoded temperature dependence. The method works normally for fermions, which have a finite representation, but needs some modification to work with bosons. These Hamiltonians are then processed into a Pauli matrix representation in order to be used as input for IBM's Qiskit package. We then use IBM's quantum simulator to calculate an approximation to the Hamiltonaian's ground state energy via the variational quantum eigensolver (VQE) algorithm. This approximation is then compared to a classically calculated value for the exact energy. The thermo field dynamics quantum algorithm has general applications to material science, high-energy physics and nuclear physics, particularly in those situations involving real-time evolution at high temperature.

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。

↑