Researchers have successfully conducted the first real-time 3D simulation demonstrating how a powerful laser beam alters the quantum vacuum. Remarkably, these simulations reflect the unusual phenomena anticipated by quantum physics, known as vacuum four-wave mixing. This principle suggests that the combined electromagnetic fields of three laser pulses can polarize a virtual electron-positron pair within a vacuum, resulting in photons bouncing toward one another as if they were billiard balls.
Illustration of photon photon scattering in a laboratory: Two green petawatt laser beams collide in focus with a third red beam to polarize the quantum vacuum. This allows the generation of a fourth blue laser beam in a unique direction and color, conserving momentum and energy. Image credit: Zixin (Lily) Zhang.
“This is not merely a matter of academic interest. It represents a significant advance toward experimental validation of quantum effects, which have largely remained theoretical,” remarks Professor Peter Norries from Oxford University.
The simulation was executed using an enhanced version of Osiris, a simulation software that models interactions between laser beams and various materials or plasmas.
“We are doctoral students at Oxford University,” shared Zixin (Lily) Zhang.
“By applying the model to a three-beam scattering experiment, we were able to capture a comprehensive spectrum of quantum signatures, along with detailed insights into the interaction region and the principal time scale.”
“We’ve rigorously benchmarked the simulation, enabling our focus to shift to more intricate, exploratory scenarios, like exotic laser beam structures and dynamic focus pulses.”
Crucially, these models furnish the specifics that experimentalists depend on to design accurate real-world tests, encompassing realistic laser configurations and pulse timing.
The simulations also uncover new insights into how these interactions develop in real-time and how subtle asymmetries in beam geometry can influence the outcomes.
According to the team, this tool not only aids in planning future high-energy laser experiments but also assists in the search for evidence of virtual particles, such as axes and millicharged particles, or potential dark matter candidates.
“The broader planned experiments at state-of-the-art laser facilities will greatly benefit from the new computational methods implemented in Osiris,” noted Professor Lewis Silva, a physicist at the Technico Institute in Lisbon and Oxford.
“The integration of ultra-intense lasers, advanced detection techniques, cutting-edge analysis, and numerical modeling lays the groundwork for a new era of laser-material interactions, opening new avenues for fundamental physics.”
The team’s paper was published today in the journal Communication Physics.
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Z. Chan et al. 2025. Computational modeling of semi-real-world quantum vacuums in 3D. Commun Phys 8, 224; doi:10.1038/s42005-025-02128-8
Source: www.sci.news
