Markus Arndt
University of Vienna, AT
Experimental Explorations of Quantum Macroscopicity
The quantum superposition principle conspicuously violates our classical concepts of locality and/or reality when it is realized with massive objects in states that would count as ‘mutually exclusive’ in our macroscopic world. We discuss different notions of “macroscopic” and focus in particular on a measure of macroscopicity which has been recently introduced by Nimmrichter and Hornberger to compare the non-classicality of experiment independent of their detailed realization. This relates to a generalized class of continuous spontaneous localization models. Since advanced quantum interference experiments are most promising for corroborating or falsifying such models we will review the current state of the art in high-mass matter wave physics and future perspectives.
1. Nimmrichter, S., et al. : Testing spontaneous localization theories with matter-wave interferometry, Phys. Rev. A, 83, 043621 (2011)
2. Nimmrichter, S., Hornberger, K.: Macroscopicity of Mechanical Quantum Superposition States, Phys. Rev. Lett., 110, 160403 (2013)
3. Bassi, A., et al: Models of wave-function collapse, underlying theories, and experimental tests, Rev. Mod. Phys., 85, 471—527 (2013)
4. Gerlich, S. et al: Quantum interference of large organic molecules, Nature Communs 2, 263 (2011)
5. Haslinger, P.: A universal matter-wave interferometer with optical ionization gratings in the time domain, Nature Physics, 9, 144—148 (2013)
6. Eibenberger, S. : Matter-wave interference with particles selected from a molecular library with masses exceeding 10 000 amu, Phys. Chem. Chem. Phys., in print 2013,
7. Hornberger, K., Gerlich, S., Haslinger, P., Nimmrichter, S., Arndt, M.: Colloquium: Quantum interference of clusters and molecules, Rev. Mod. Phys., 84, 157—173 (2012)