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arXiv 2302.03093quant-ph
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自适应变分量子动力学计算多体格林函数

Computing the many-body Green's function with adaptive variational quantum dynamics

Niladri Gomes, David B. Williams-Young, Wibe A. de Jong

摘要:

我们提出了一种使用自适应变分量子动力学模拟方法来计算多体实时格林函数的方法。实时格林函数涉及一个量子态的时间演化与一个额外的电子相对于基态波函数,首先表示为状态矢量的线性组合。实时演化和格林函数是通过将各个状态向量的动态结合在线性组合中来获得的。自适应协议的使用使我们能够在运行仿真时实时生成紧凑的ansätze。为了提高谱特征的收敛性,采用Padé逼近法得到格林函数的傅里叶变换。我们演示了IBM Q量子计算机上的格林函数的评估。作为我们的错误缓解策略的一部分,我们开发了一种分辨率增强方法,我们成功地应用于来自真实量子硬件的噪声数据。

英文摘要:

We present a method to compute the many-body real-time Green's function using an adaptive variational quantum dynamics simulation approach. The real-time Green's function involves the time evolution of a quantum state with one additional electron with respect to the ground state wavefunction that is first expressed as a linear combination of state vectors. The real-time evolution and Green's function is obtained by combining the dynamics of the individual statevectors in the linear combination. The use of the adaptive protocol enables us to generate compact ansätze on-the-fly while running the simulation. In order to improve the convergence of spectral features Padé approximants are applied to obtain the Fourier transform of Green's function. We demonstrate the evaluation of Green's function on an IBM Q quantum computer. As a part of our error mitigation strategy, we develop a resolution-enhancing method that we successfully apply on the noisy data from the real quantum hardware.

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