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We are performing ultra-low temperature experiments with a radio-frequency, nanomechanical resonator coupled to a superconducting single electron transistor, a system which has demonstrated the closest approach to the uncertainty principle for continuous position detection (Dx/Dx_SQL = 5), the highest force sensitivity (0.6 aN/rtHz), and the closest approach to the quantum ground state of a mechanical system (N=25) (1). Recently, we have used the resonator to detect the asymmetric, quantum noise of the SET, which produces the back-action forces close to what is required by the uncertainty principle. In addition, have discovered an unexpected cooling mechanism, analogous to optical molasses, which is a result of resonant Josephson effects in the transistor. Using these techniques and devices, we are anticipating the observation of squeezed, superposition, and entangled states of a mechanical device.
(1) LaHaye, Buu, Camarota, Schwab, "Approaching the Quantum Limit of a Nanomechanical Resonator," Science 304, 74 (2004). |
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