Levitating glass sphere becomes entangled with light at room temperature
Today, many physicists are actively exploring how light could be used to link objects through quantum entanglement. By fully harnessing the effect, they hope to unlock a wide array of applications, from secure communication networks spanning vast distances to sensitive new tests of the fundamental laws of physics.
Scientists have achieved a significant milestone in the field of quantum physics by entangling the motion of a tiny levitating glass sphere with light, all at room temperature. This breakthrough, published in the prestigious journal Science, marks a major advancement in our understanding of quantum entanglement and its potential applications.
The research, led by Francesco Marin at the University of Florence, involved a glass sphere just 100 nanometers in diameter. The sphere was held in place using an optical tweezer – a tightly focused laser beam. This setup, combined with two lasers of slightly different wavelengths, enabled the scientists to both stabilize the sphere's motion and generate entanglement simultaneously.
Entanglement occurs when two quantum particles become deeply interconnected, so that each particle's properties cannot be fully described without considering the other. However, this delicate link is easily disrupted by environmental disturbances. Previous attempts to create entanglement between photons and larger particles were only successful at temperatures close to absolute zero.
The key to this new success was the use of two lasers. One laser cooled and steadied the sphere's oscillations, while the other was free to entangle this motion with the light. By measuring the light emitted from the mirrors over an extended period, the researchers were able to reconstruct the full pattern of connections between the sphere's motion and the light.
Crucially, the team confirmed that their measured correlations met the mathematical threshold for entanglement, despite the experiment being conducted at room temperature. This means that even outside of ultra-cold conditions, the two systems remained linked in a way that defies classical physics.
The implications of this achievement are profound. If the entanglement can be strengthened and actively controlled, it could allow multiple levitated spheres to be entangled through a shared field of light. This would open up new avenues for testing quantum mechanics at larger scales and exploring its interaction with gravity. Furthermore, it could pave the way for the development of quantum networks, where information is seamlessly transferred between moving objects and light across vast distances.
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