论文标题
量子计算机上的Lipkin模型
Lipkin model on a quantum computer
论文作者
论文摘要
原子核是探索和测试对宇宙的新见解的重要实验室,例如直接检测暗物质或探索中微子的特性的实验。感兴趣的目标通常是沉重,复杂的核,它们可以通过经典计算机可靠地对其进行可靠地建模(以及量化这些模型的不确定性)的能力。因此,对于这些应用,将量子计算应用于核结构上非常感兴趣。作为朝这个方向迈出的早期一步,尤其是在相关量子计算中的不确定性方面,我们开发了电路以实现Lipkin-Meshkov-Glick模型的变异量子量化量化算法(VQE)算法,该算法通常用于核物理学社区中,以作为多种身体方法的测试。我们为两个和三个粒子提供VQE的量子电路,并讨论了更多颗粒的电路构建。在IBM量子体验上实现两粒子系统的VQE,我们将初始化和两倍的门确定为最大的错误来源。我们发现,缓解错误程序大大减少了结果的错误,但是需要进行其他量子硬件改进才能使量子计算足够准确,以与当前最佳的经典方法具有竞争力。
Atomic nuclei are important laboratories for exploring and testing new insights into the universe, such as experiments to directly detect dark matter or explore properties of neutrinos. The targets of interest are often heavy, complex nuclei that challenge our ability to reliably model them (as well as quantify the uncertainty of those models) with classical computers. Hence there is great interest in applying quantum computation to nuclear structure for these applications. As an early step in this direction, especially with regards to the uncertainties in the relevant quantum calculations, we develop circuits to implement variational quantum eigensolver (VQE) algorithms for the Lipkin-Meshkov-Glick model, which is often used in the nuclear physics community as a testbed for many-body methods. We present quantum circuits for VQE for two and three particles and discuss the construction of circuits for more particles. Implementing the VQE for a two-particle system on the IBM Quantum Experience, we identify initialization and two-qubit gates as the largest sources of error. We find that error mitigation procedures reduce the errors in the results significantly, but additional quantum hardware improvements are needed for quantum calculations to be sufficiently accurate to be competitive with the best current classical methods.