Enhancing photon-axion conversion probability with squeezed coherent states

TL;DR

This paper develops a quantum field theoretical framework for photon-axion conversion, demonstrating that using squeezed coherent states can significantly enhance the conversion probability, which is crucial for axion detection.

Contribution

It introduces a quantum approach to photon-axion conversion and shows that squeezed coherent states improve detection prospects.

Findings

Squeezed coherent states increase conversion probability.

Quantum formulation allows precise probability evaluation.

Enhanced detection sensitivity for axions.

Abstract

In particle physics, axions and axion-like particles are ubiquitous. Remarkably, ultra-light axions could constitute dark matter or dark energy. Therefore, it is important to detect axions experimentally. In the presence of a magnetic field, a photon can be converted into an axion, and vice versa. Utilizing the conversion phenomenon, several methods for detecting axions have been proposed. To improve detectability, it is desirable to use quantum sensing. However, since the conversion process is usually treated as classical wave dynamics, it is unclear how to incorporate quantum effects such as entanglement. In this work, we formulate the photon-axion conversion in a quantum field theoretical manner. As a result, we succeed in evaluating the conversion probability from a photon quantum state to an axion quantum state. In particular, it turns out that squeezed coherent states can enhance the conversion probability.