1. General Seminars
# Non-interferometric experimental tests of macroscopic spatial quantum superposition

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Europe/Rome

Aula Conversi (LNF)
### Aula Conversi

#### LNF

Description

We will report on new ideas to experimentally test the superposition principle with non-interferometric methods. Testing the superposition principle intrinsically also means to test suggested extensions of quantum theory. For instance collapse models predict a heating effect, which results in a Brownian-like random motion of any isolated particle in space. The heating can be monitored using optomechanical systems even in the classical regime, if competing sources of heat can be reduced sufficiently. We will emphasise levitated optomechanical systems and discuss the possibility to test the heating effect by detecting the motion of the particle in space [4] as well as in the frequency domain where heating is manifested as increase of the spectral feature [5].

We will show quantitative calculations for experiments in both regimes and compare to the state-of-the-art. We will also report on the status of our experiments on optical levitation and parametric feedback cooling of the 3d motion of dielectric nanoparticles at high vacuum conditions of 10

[1] Bateman, J., S. Nimmrichter, K. Hornberger, and H. Ulbricht,

[2] Bassi, A., K. Lochan, S. Satin, T.P. Singh, and H. Ulbricht,

[3] Bahrami, M., A. Bassi, and H. Ulbricht,

[4] Bera, S., B. Motwani, T.P. Singh, and H. Ulbricht,

[5] Bahrami, M., M. Paternostro, A. Bassi, and H. Ulbricht,