Year: 2026
Type: preprint
Abstract: The emergence of entangled quantum optical states in high-harmonic generation raises a fundamental problem about its characterization, namely, \textit{how can entanglement of extreme-ultraviolet radiation be certified for attosecond light fields?} Here, we provide experimentally accessible separability tests, particularly showing that attosecond photoelectron interferometry provides a direct solution to this problem. This is achieved by a quantum optical treatment of mapping photoelectron interferometry to the measurement of optical correlation functions. This yields a negative-partial-transpose witness for infrared-XUV entanglement and a sufficient witness of genuine multipartite entanglement without auxiliary optical measurements. We evaluate both witnesses on explicit optical states and identify how the protocol can be extended to XUV-XUV entanglement certification. Hence, we establish attosecond photoelectron interferometry as a general framework for entanglement certification across a wide range of optical frequencies.
Source: arXiv (Cornell University)
Author: Stammer, Philipp
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1322453578, G169161837, G1908469581, G2038104832, G2064873908, G2462415295, G2575991346, G2763573136, G280048558, G288263039, G2988934680, G3005324705, G318412399, G3288897321, G3546882995, G3596968109, G4239348134, G4391008399, G4571205363, G4993905653, G554358111, G5554424168, G5852091828, G5922099756, G6294180727, G631184005, G6482940084, G6520718613, G6656126374, G7048927246, G7425137858, G8180681537, Optical Topologic Logic
OpenAlex ID: W7223319703