Markus Arndt
(University of Vienna)
23/03/2015, 09:30
This talk introduces concepts and technologies in quantum interference experiments with massive particles, ranging from atoms and complex molecules today to dielectric nanoparticles in the future. Our work is motivated by the insight that the quantum superposition principle is at the heart of all quantum physics but that matter wave interference has not yet been tested experimentally in the...
Jonas Rodewald
(University of Vienna)
23/03/2015, 10:15
We demonstrate a matter-wave interferometer in the time domain (OTIMA) as a powerful tool for testing the validity of quantum theory for large particles [1,2]. The interferometer operates in the near-field regime and utilizes three pulsed standing laser wave gratings. These imprint a periodic phase pattern on to the traversing matter waves and the photo depletion probability is modulated...
James Bateman
(University of Southampton)
23/03/2015, 11:30
We are building a matterwave interferometer for 10^6 amu particles with 200 nm separation to test the superposition principle for massive particles [1] . A successful demonstration would correspond to a macroscopicity [2] mu=18 and would begin to constrain CSL lambda_CSL<1.4 · 10^r -11 Hz. I will outline the theoretical approach, describe the rationale for our design choices, and review the...
Andrea Alberti
(University of Bonn)
23/03/2015, 12:15
We report on a stringent test of the nonclassicality of the motion of a massive quantum particle, which propagates on a discrete lattice. Measuring temporal correlations of the position of single atoms performing a quantum walk, we observe a 6σ violation of the Leggett-Garg inequality. Our results rigorously excludes (i.e., falsifies) any explanation of quantum transport based on classical,...