Year: 2023
Type: article
Abstract: Quantum computers, using efficient Hamiltonian evolution routines, have the potential to simulate Green's functions of classically intractable quantum systems. However, the decoherence errors of near-term quantum processors prohibit large evolution times, posing limits to the spectrum resolution. In this paper, we show that atomic norm minimization, a well-known super-resolution technique, can significantly reduce the minimum circuit depth for accurate spectrum reconstruction. We demonstrate this technique by recovering the spectral function of an impurity model from measurements of its Green's function on an IBM quantum computer. The reconstruction error with the atomic norm minimization is one order of magnitude smaller than with more standard signal processing methods. Super-resolution methods can facilitate the simulation of large and previously unexplored quantum systems, and may constitute a useful nonvariational tool to establish a quantum advantage in the near future.
Source: Physical Review A
Authors: Diogo Cruz, Duarte Magano
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4384827559