189 citations · 365 across the 11 of their papers we have counts for
11 papers
Violation of a Leggett-Garg inequality using ideal negative measurements in neutron interferometry
Elisabeth Kreuzgruber, Richard Wagner, Niels Geerits +2
We report on an experiment that demonstrates the violation of a Leggett-Garg inequality (LGI) with neutrons. LGIs have been proposed in order to assess how far the predictions of q…
Three-Path Quantum Cheshire Cat Observed in Neutron Interferometry
Armin Danner, Niels Geerits, Hartmut Lemmel +3
The paradoxical phenomenon of the quantum Cheshire Cat (qCC) refers to situations where different properties of a particle appear to be localised in different paths of an interfero…
Phase Vortex Lattices in Neutron Interferometry
Niels Geerits, Hartmut Lemmel, Anna-Sophie Berger +1
A combination of aluminium prisms inserted into a nested loop interferometer is used to generate a neutron phase vortex lattice with significant extrinsic orbital angular momentum,…
Neutron interference from a split-crystal interferometer
Hartmut Lemmel, Michael Jentschel, Hartmut Abele +5
We report the first successful operation of a neutron interferometer having a separate beam recombining crystal. We achieved this result at the neutron interferometry setup S18 at…
Quantifying the presence of a neutron in the paths of an interferometer
Hartmut Lemmel, Niels Geerits, Armin Danner +3
It is commonly assumed that no accurate experimental information can be obtained on the path taken by a particle when quantum interference between the paths is observed. However, r…
Direct experimental test of commutation relation via weak value
Richard Wagner, Wenzel Kersten, Armin Danner +3
The canonical commutation relation is the hallmark of quantum theory and Heisenberg's uncertainty relation is a direct consequence of it. But despite its fundamental role in quantu…
Happy Birthday, Ultra-Cold Neutron!
Hartmut Abele, Tobias Jenke, Hartmut Lemmel
What is driving the accelerated expansion of the universe and do we have an alternative for Einstein's cosmological constant? What is dark matter made of? Do extra dimensions of sp…
Spin - Rotation Coupling Observed in Neutron Interferometry
Armin Danner, Bülent Demirel, Wenzel Kersten +4
Einstein's theory of general relativity and quantum theory form the two major pillars of modern physics. However, certain inertial properties of a particle's intrinsic spin are inc…
Multifold paths of neutrons in the three-beam interferometer detected by tiny energy-kick
Hermann Geppert-Kleinrath, Tobias Denkmayr, Stephan Sponar +3
A neutron optical experiment is presented to investigate the paths taken by neutrons in a three-beam interferometer. In various beam-paths of the interferometer, the energy of the…
Experimental demonstration of direct path state characterization by strongly measuring weak values in a matter-wave interferometer
Tobias Denkmayr, Hermann Geppert, Hartmut Lemmel +4
A novel method was recently proposed and experimentally realized for characterizing a quantum state by directly measuring its complex probability amplitudes in a particular basis u…
Observation of a quantum Cheshire Cat in a matter wave interferometer experiment
Tobias Denkmayr, Hermann Geppert, Stephan Sponar +4
From its very beginning quantum theory has been revealing extraordinary and counter-intuitive phenomena, such as wave-particle duality, Schrödinger cats and quantum non-locality. I…