Toward quantum-limited position measurements using optically levitated microspheres

We propose the use of optically levitated microspheres as test masses in experiments aimed at reaching and potentially exceeding the standard quantum limit for position measurements. Optically levitated microspheres have low mass and are essentially free of suspension thermal noise, making them well suited for experimentally testing our understanding of quantum-limited measurements. (C) 2003 Elsevier B.V. All rights reserved.