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A: Fachverband Atomphysik
A 31: Poster Session III
A 31.2: Poster
Donnerstag, 9. März 2017, 17:00–19:00, P OG1
Cavity Optomechanics and Spin-Optodynamics with Cold Atoms — •Nicolas Spethmann1, Jonathan Kohler2, Sydney Schreppler2, Lukas Buchmann2, and Dan Stamper-Kurn2,3 — 1Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Physics, University of California, Berkeley, CA 94720, USA — 3Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Cold atom experiments routinely deliver samples with excellent control over both external and internal degrees of freedom. We combine these quantum systems with quantum-limited sensing facilitated by a high-finesse optical cavity, opening the initially well isolated quantum system to the environment in a controlled manner.
We employ the sensitive detection of motion of the atomic ensemble to demonstrate force sensing near the standard quantum limit, achieving a sensitivity of (42yN)2/Hz. We further demonstrate cavity-mediated coupling of two near-groundstate mechanical oscillators limited by quantum back-action. Employing the interaction of the atomic spin with the cavity light, we create a spin-analog of a harmonic oscillator, allowing for measurement and coherent control of collective atomic spin oscillators. This gives us access to unique features of spin-optodynamics, such as a negative temperature, high-energy ’ground state’. Our results point to the potential, and also the challenges, of detecting and coupling quantum objects with quantum light.