Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ab initio nuclear structure via quantum adiabatic algorithm   Background: Solving nuclear many-body problems with an ab initio approach is
widely recognized as a computationally challenging problem. Quantum computers
offer a promising path to address this challenge. There are urgent needs to
develop quantum algorithms for this purpose.
  Objective: In this work, we explore the application of the quantum algorithm
of adiabatic state preparation with quantum phase estimation in ab initio
nuclear structure theory. We focus on solving the low-lying spectra (including
both the ground and excited states) of simple nuclear systems.
  Ideas: The efficiency of this algorithm is hindered by the emergence of small
energy gaps (level crossings) during the adiabatic evolution. In order to
improve the efficiency, we introduce techniques to avoid level crossings: 1) by
suitable design of the reference Hamiltonian; 2) by insertions of perturbation
terms to modify the adiabatic path.
  Results: We illustrate this algorithm by solving the deuteron ground state
energy and the spectrum of the deuteron bounded in a harmonic oscillator trap
implementing the IBM Qiskit quantum simulator. The quantum results agree well
the classical results obtained by matrix diagonalization.
  Outlook: With our improvements to the efficiency, this algorithm provides a
promising tool for investigating the low-lying spectra of complex nuclei on
future quantum computers.

20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci