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We demonstrate robust photoelectron entanglement using orbital angular momentum (OAM) in ultrafast attosecond imaging. This OAM entanglement is simpler to measure and robust to noise, enhancing imaging capabilities.

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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.