Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-06-04
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
19 pages (double-spaced) including 4 figures and references
Scientific paper
When performing continuous measurements of position with sensitivity approaching quantum mechanical limits, one must confront the fundamental effects of detector back-action. Back-action forces are responsible for the ultimate limit on continuous position detection, can also be harnessed to cool the observed structure, and are expected to generate quantum entanglement. Back-action can also be evaded, allowing measurements with sensitivities that exceed the standard quantum limit, and potentially allowing for the generation of quantum squeezed states. We realize a device based on the parametric coupling between an ultra-low dissipation nanomechanical resonator and a microwave resonator. Here we demonstrate back-action evading (BAE) detection of a single quadrature of motion with sensitivity 4 times the quantum zero-point motion, back-action cooling of the mechanical resonator to n = 12 quanta, and a parametric mechanical pre-amplification effect which is harnessed to achieve position resolution a factor 1.3 times quantum zero-point motion.
Clerk Aashish A.
Hertzberg Jared B.
Ndukum T.
Rocheleau T.
Savva M.
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