# Quantum, Nonlocal Aberration Cancellation

## TL;DR

This paper demonstrates a quantum technique using entangled photons to nonlocally cancel optical aberrations, including defocus, thereby improving imaging resolution without local correction.

## Contribution

It introduces a method for nonlocal aberration correction using entangled photons, including simultaneous cancellation of even and odd order aberrations.

## Key findings

- Successful nonlocal cancellation of aberrations demonstrated
- Enhanced spatial resolution in quantum imaging achieved
- Applicable to correcting defocus in optical systems

## Abstract

Phase distortions, or aberrations, can negatively influence the performance of an optical imaging system. Through the use of position-momentum entangled photons, we nonlocally correct for aberrations in one photon's optical path by intentionally introducing the complementary aberrations in the optical path of the other photon. In particular, we demonstrate the simultaneous nonlocal cancellation of aberrations that are of both even and odd order in the photons' transverse degrees of freedom. We also demonstrate a potential application of this technique by nonlocally cancelling the effect of defocus in a quantum imaging experiment and thereby recover the original spatial resolution.