Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct estimation of the energy gap between the ground state and excited
  state with quantum annealing   Quantum chemistry is one of the important applications of quantum information
technology. Especially, an estimation of the energy gap between a ground state
and excited state of a target Hamiltonian corresponding to a molecule is
essential. In the previous approach, an energy of the ground state and that of
the excited state are estimated separately, and the energy gap can be
calculated from the subtraction between them. Here, we propose a direct
estimation of the energy gap between the ground state and excited state of the
target Hamiltonian with quantum annealing. The key idea is to combine a Ramsey
type measurement with the quantum annealing. This provides an oscillating
signal with a frequency of the energy gap, and a Fourier transform of the
signal let us know the energy gap. Based on typical parameters of
superconducting qubits, we numerically investigate the performance of our
scheme when we estimate an energy gap between the ground state and first
excited state of the Hamiltonian. We show robustness against non-adiabatic
transitions between the ground state and first-excited state. Our results pave
a new way to estimate the energy gap of the Hamiltonian for quantum chemistry.

25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs