First quantum squeezing achieved with nanoscale particle motion

Researchers at the University of Tokyo have achieved a groundbreaking feat by demonstrating quantum squeezing of the motion of a levitated nanoscale particle. Quantum squeezing reduces the uncertainty in a particle’s position or velocity below the standard quantum limit set by zero-point fluctuations, a fundamental aspect of quantum mechanics. By levitating a glass nanoparticle in a vacuum and cooling it near its ground state, the team managed to measure a velocity distribution narrower than the quantum uncertainty limit, marking the first such observation for nanoscale particle motion. This experiment bridges the gap between microscopic quantum phenomena and larger-scale objects, offering a new platform to explore quantum mechanics at mesoscopic scales. The achievement required overcoming significant challenges, including stabilizing the levitated particle and minimizing environmental noise. The sensitivity of the nanoscale particle to external fluctuations, while initially a hurdle, now provides a powerful system for studying the boundary between classical and quantum physics. Beyond fundamental science, this advance holds promise for practical applications such as ultra-precise quantum sensors that could enable GPS