An ultra-narrow line width levitated nano-oscillator for testing dissipative wavefunction collapse
2020
This work measures dissipation affecting a nano-particle levitated in a Paul trap in high vacuum. By evaluating the energy power spectral density of the resulting low frequency harmonic oscillator, the authors spectrally resolve an ultra-narrow linewidth of 80 \textmu{}Hz. These measurements are then used to place bounds on two wavefunctions collapse models in their dissipative variants, namely the continuous spontaneous localization and the Di\'osi-Penrose model
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