Entanglement of orbital angular momentum in non-sequential double ionization

Area of Science:

• Quantum physics
• Ultrafast science
• Attosecond imaging

Background:

• Entanglement can enhance imaging, but its application in attosecond imaging is unexplored.
• Orbital angular momentum (OAM) entanglement offers a discrete variable approach for simpler interpretation and measurement.

Purpose of the Study:

• To explore the potential of OAM entanglement for attosecond imaging.
• To demonstrate robust photoelectron entanglement in ultrafast processes.

Main Methods:

• Investigated non-sequential double ionization (NSDI) as a correlated process.
• Utilized discrete OAM variables for entanglement quantification and measurement.
• Employed logarithmic negativity and an entanglement witness to assess entanglement robustness and detection.

Main Results:

• Demonstrated robust photoelectron entanglement in NSDI.
• Showcased OAM entanglement's resilience to incoherence.
• Identified optimal targets and field parameters for generating highly entangled photoelectron pairs.

Conclusions:

• OAM entanglement provides a viable and robust method for attosecond imaging enhancement.
• The developed methodology offers a general approach to quantify and measure entanglement in ultrafast processes.
• This work paves the way for improved attosecond imaging and the generation of OAM-entangled electrons.