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SUMMARY:Control\, sensing and gravitational coupling of milligram pendulum
 s: towards interfacing quantum and gravity
DTSTART:20260204T100000Z
DTEND:20260204T113000Z
DTSTAMP:20260417T214600Z
UID:indico-event-1666@indico.dfa.unipd.it
DESCRIPTION:Speakers: Onur Hosten (Institute of Science and Technology Aus
 tria)\n\nCan we test the quantum mechanical nature of gravitational fields
 ? Milligram-scale optomechanical experiments present a frontier for bridg
 ing quantum mechanics and gravitational physics by aiming to strike a bal
 ance between 1) making gravitational couplings of the controlled objects 
 dominant and 2) making the motions of these objects quantum noise dominate
 d. Required systems necessitate low-frequency dynamics that is typically 
 considered quantum-unfriendly\, but seems to be needed to achieve a large
  figure-of-merit in the problem\, quantifying the ability to generate qua
 ntum entanglement gravitationally.\nIn this talk\, I will first focus on o
 ur 1-milligram suspended torsional pendulum operating at 18 Hz\, and the 
 successful laser cooling of its motion to 240~microkelvins. I will elucida
 te the resulting boost in the quantum coherence length of this pendulum\,
  benchmarking a remarkable quantum-gravity figure-of-merit with a vast imp
 rovement potential [1]. I will outline a path towards gravitational entan
 glement utilizing our zig-zag optical cavities [2] to boost the interactio
 ns of light and torsional pendulums. I will conclude with the ongoing eff
 ort of achieving gravitationally-limited coupling between two free runnin
 g ~1 milligram pendulums – aiming to push observable interparticle gravi
 tational couplings down by 3 orders of magnitude.\n\nhttps://indico.dfa.un
 ipd.it/event/1666/
LOCATION:1/1-2 - Aula "C. Voci" (Dipartimento di Fisica e Astronomia - Edi
 ficio Marzolo)
URL:https://indico.dfa.unipd.it/event/1666/
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