Scientists Place Metal Particle in Two Locations at Once in Quantum Physics Breakthrough
Researchers demonstrate quantum superposition in sodium nanoparticles containing thousands of atoms, pushing the boundaries of quantum mechanics toward macroscopic scales.
Scientists at the University of Vienna have achieved a remarkable quantum physics breakthrough by demonstrating that metallic nanoparticles made of thousands of sodium atoms can exist in quantum superposition, effectively occupying multiple locations simultaneously. The experiment, published in Nature, represents one of the most ambitious tests of quantum mechanics at scales approaching the macroscopic world.
The research team, led by Markus Arndt and Stefan Gerlich, used sodium clusters measuring approximately 8 nanometers across and containing between 5,000 and 10,000 atoms each. Despite their relatively large size and mass exceeding 170,000 atomic mass units, these metallic particles still exhibited quantum interference patterns when passed through a series of laser-generated diffraction gratings.
The experimental setup involved creating ultracold sodium clusters that traveled through three ultraviolet laser beams acting as diffraction gratings. The first laser established each particle's position with 10-nanometer accuracy while simultaneously placing them into quantum superposition states. As the possible particle paths overlapped later in the apparatus, they produced measurable striped interference patterns that matched quantum theoretical predictions.
Lead author and doctoral student Sebastian Pedalino emphasized the counterintuitive nature of the results, noting that such large metal chunks would be expected to behave according to classical physics rather than quantum rules. The particles' quantum states spread over regions dozens of times larger than the physical particles themselves, creating what physicists describe as "Schrödinger cat states" at unprecedented scales.
The achievement pushes the boundaries of quantum mechanics testing and could have implications for understanding the transition between quantum and classical physics. The work suggests that even surprisingly large objects continue to obey quantum mechanical principles, challenging conventional assumptions about where quantum effects cease to dominate physical behavior.