Recent ideas and technological developments have made possible studies of macroscopic objects deep in the quantum regime. In the talk I will discuss experiments where an entangled Einstein-Podolsky-Rosen (EPR) state has been generated between distant mechanical and atomic oscillators [1,2]. The concept of an oscillator with an effective negative mass crucial for those experiments will be presented. Progress towards application of those ideas to gravitational wave detectors following the proposal  will be reported. Another challenge within quantum physics of macroscopic objects is generation of Fock states corresponding to single quantum excitations of an oscillator. Progress along those lines with Fock states of motion  and of a collective atomic spin  will be presented.
1. Møller et al. Nature, 547, 191 (2017).
2. Thomas et al. Nature Physics 10.1038/s41567-020-1031-5. (2020)
3. Khalili and Polzik. Phys. Rev. Lett. 121, 031101 (2018).
4. Galinsky et al. Optica, 7(6), 718 (2020).
5. Dideriksen et al. Nature Comm. 12, 3699 (2021)
Refreshments @ 3:30 p.m.)
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Note: Parking for these events can be found in the basement of the CASE building (the Euclid Parking Garage).