Quantum phenomena in attosecond science

TL;DR

This paper reviews recent experimental and theoretical advances in quantum phenomena within attosecond science, emphasizing the importance of quantum effects like entanglement and their distinction from classical phenomena.

Contribution

It highlights the role of quantum effects such as entanglement in attosecond processes and discusses recent progress in experimental and theoretical understanding.

Findings

Quantum effects are crucial in high-harmonic generation and above-threshold ionization.

Entanglement significantly influences attosecond experimental outcomes.

Distinguishing quantum phenomena from classical effects remains a key focus.

Abstract

Attosecond science has opened up new frontiers in our understanding of processes happening on the intrinsic timescale of electrons. The ability to manipulate and observe phenomena at the attosecond level has yielded groundbreaking insights into processes such as electron dynamics and the behavior of matter under extreme conditions. This interdisciplinary field bridges various research areas such as quantum optics, quantum chemistry and quantum information science facilitating a cohesive understanding. However, despite many emerging successful applications, the discussion about intrinsic quantum effects has mainly been ignored. In this Perspective, we explore the latest advancements in quantum phenomena within attosecond science, encompassing both experimental and theoretical progress. Specifically, in the context of high-harmonic generation and above-threshold ionization, we focus on discerning genuinely quantum observations and distinguishing them from classical phenomena. Additionally, we illuminate the often overlooked yet significant role of entanglement in attosecond processes, elucidating its influence on experimental outcomes.