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Updated: Sep 14, 2025
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Entanglement transfer in a composite electron-ion-photon system.
Axel Stenquist1, Jakob Nicolai Nicolai Bruhnke1, Felipe Zapata2
1Department of Physics, Lund University, 22100 Lund, Sweden.
Summary
This study reveals how quantum entanglement transfers from an electron-ion pair to an electron-photon pair during photoionization. Researchers used time-resolved von Neumann entropies to track this information sharing process.
Area of Science:
- Quantum mechanics
- Atomic and molecular physics
- Quantum information science
Background:
- Photoionization is a fundamental process where a photon ejects an electron from an atom or molecule.
- Entanglement, a quantum mechanical phenomenon, plays a crucial role in understanding particle interactions.
- Information sharing between quantum particles is key to quantum technologies.
Purpose of the Study:
- To investigate the transfer of quantum entanglement during photoionization.
- To quantify information sharing between electrons, ions, and photons.
- To explore methods for observing and controlling entanglement dynamics.
Main Methods:
- Utilizing time-resolved von Neumann entropies to analyze quantum information.
- Studying the dynamics of electron-ion and electron-photon pairs.
- Employing a phase-locked two-pulse laser sequence for controlled excitation.
Main Results:
- Demonstrated entanglement transfer from an electron-ion pair to an electron-photon pair via fluorescence.
- Observed multipartite entanglement involving the electron, ion, and photon on intermediate timescales.
- Established a method using time symmetry and strong coupling to reveal entanglement transfer.
Conclusions:
- Entanglement transfer in photoionization is a quantifiable process.
- Time-resolved entropy measurements provide insights into quantum information dynamics.
- Coincidence measurements of photon number and electron kinetic energy can probe entanglement dynamics.
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