Back-action Evading Measurements of Nanomechanical Motion - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: When performing continuous measurements of position with sensitivityapproaching quantum mechanical limits, one must confront the fundamentaleffects of detector back-action. Back-action forces are responsible for theultimate limit on continuous position detection, can also be harnessed to coolthe observed structure, and are expected to generate quantum entanglement.Back-action can also be evaded, allowing measurements with sensitivities thatexceed the standard quantum limit, and potentially allowing for the generationof quantum squeezed states. We realize a device based on the parametriccoupling between an ultra-low dissipation nanomechanical resonator and amicrowave resonator. Here we demonstrate back-action evading BAE detection ofa single quadrature of motion with sensitivity 4 times the quantum zero-pointmotion, back-action cooling of the mechanical resonator to n = 12 quanta, and aparametric mechanical pre-amplification effect which is harnessed to achieveposition resolution a factor 1.3 times quantum zero-point motion.



Autor: J. B. Hertzberg, T. Rocheleau, T. Ndukum, M. Savva, A. A. Clerk, K. C. Schwab

Fuente: https://arxiv.org/







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