Glass nanoparticles trapped by lasers in extreme vacuum are considered a promising platform for exploring the limits of the quantum world. Since the advent of quantum theory, the question at which sizes an object starts being described by the laws of quantum physics rather than the rules of classica
), Oriol Romero-Isart , and Romain Quidant is attempting to answer precisely this question within the ERC-Synergy project Q-Xtreme. A crucial step on the way to this goal is to reduce the energy stored in the motion of the nanoparticle as much as possible, i.e. to cool the particle down to the so-called quantum ground-state.The Q-Xtreme team has been working together on ground-state cooling of nanoparticles for a long time.
The vacuum chamber with the experimental setup to levitate a particle inside of a cavity. The cavity consists of two mirrors coated to be extremely reflective for infrared light. The cylindrical part in the center holds a lens at its tip to focus the infrared laser down to a point at which the particle is trapped. Credit: Johannes Piotrowski
“Achieving ground-state cooling along more than one direction is key for exploring novel quantum physics,” emphasizes Gonzalez-Ballestero of the Institute for Quantum Optics and Quantum Information at the Austrian Academy of Sciences and the Department of Theoretical Physics at the University of Innsbruck.
Reference: “Simultaneous ground-state cooling of two mechanical modes of a levitated nanoparticle. Johannes Piotrowski, Dominik Windey, Jayadev Vijayan, Carlos Gonzalez-Ballestero, Andrés de los Ríos Sommer, Nadine Meyer, Romain Quidant, Oriol Romero-Isart, René Reimann and Lukas Novotny” 6 March 2023,
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