Abstract
The control of low-entropy quantum states of a micro-oscillator could not only allow researchers to probe quantum phenomena—such as entanglement and decoherence—at an unprecedentedly large scale, but also enable their use as interfaces in hybrid quantum systems. Preparing and probing an oscillator in the conceptually simplest low-entropy state, its quantum ground state, has now become a major goal in Cavity Optomechanics [1]. However, to experimentally achieve this goal, its effective temperature Teff has to be reduced sufficiently so that ħΩm >> kBTeff (ħ is the reduced Planck constant, kB the Boltzman constant, and Ωm the mechanical resonance pulsation). Using conventional cryogenic refrigeration, a nanomechanical oscillator has recently been cooled to the quantum regime and probed by a superconducting qubit to which it was piezoelectrically coupled [2].
© 2011 Optical Society of America
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