Super-resolution of Green's functions on noisy quantum computers
Authors: Diogo Cruz, Duarte Magano
AI-generated Key Points
- Quantum computers have shown promise in simulating complex quantum systems beyond classical computers' capabilities.
- Super-resolution techniques like Atomic Norm Minimization can overcome the limitation posed by decoherence errors of near-term quantum processors.
- Diogo Cruz and Duarte Magano demonstrate how Atomic Norm Minimization can recover the spectral function of an impurity model from measurements of its Green's function on an IBM quantum computer.
- The use of Atomic Norm Minimization reduces reconstruction error by one order of magnitude compared to standard signal processing methods.
- Super-resolution methods can facilitate the simulation of large and previously unexplored quantum systems, potentially establishing a quantum advantage in the future.
- Efficient Hamiltonian evolution routines are highlighted as useful for simulating Green's functions of classically-intractable quantum systems, but decoherence errors pose limits on spectrum resolution due to prohibitive large evolution times.
- Super-resolution techniques such as Atomic Norm Minimization can significantly reduce circuit depth requirements for accurate spectrum reconstruction.
- These findings could pave the way for new breakthroughs in various fields such as materials science, chemistry, and physics.
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 work, 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 non-variational tool to establish a quantum advantage in a nearer future.
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