May 16, 2019Published by Stephan Sponar
We have measured the n-4He coherent scattering length to be b(4He) = (3.0982 +/- 0.0023) fm utilizing a perfect silicon crystal neutron interferometer. This measurement provides over a factor of 10 improvement in precision and differs by 0.162 fm compared to the most commonly used value. Neutron scattering data with light nuclei targets provide useful tests of nuclear… View Article
April 30, 2019Published by Stephan Sponar
Simulating a neutron interferometer A computer program is presented which simulates a perfect crystal neutron interferometer using the plane wave formalism of dynamical diffraction. The program can deal with phase shifters, absorbing samples, refracting wedges and tilted crystal blades. Finally, a vibrating interferometer crystal is investigated.
April 30, 2019Published by Stephan Sponar
Long-Baseline Universal Matter-wave interferometry Stefan Gerlich, University of Vienna In recent years there has been a growing experimental effort to create and investigate highly macroscopic quantum states. Matter-wave interferometers of the Talbot-Lau type have proven to be particularly suited for the exploration of the quantum nature of massive particles. We here report on the completion… View Article
April 29, 2019Published by Stephan Sponar
Gravity gradient cancellation in space-borne quantum tests of the universality of free fall Sina Loriani, Sven Abend, Holger Ahlers, Wolfgang Ertmer, Franck Pereira Dos Santos, Dennis Schlippert, Christian Schubert, Peter Wolf, Ernst M Rasel and Naceur Gaaloul In tests of the weak equivalence principle (WEP) [1], the free fall acceleration of objects of different composition… View Article
April 26, 2019Published by Stephan Sponar
Phase Contrast Imaging of Materials and Magnetic Fields using Scanning Electron Interferometry The advent of efficient nanoscale diffractive electron optics, direct electron imaging detectors, and improved electron microscopes enable a new form of separated-path scanning electron interferometry. We use a single nanoscale grating as an amplitude-dividing beam splitter that can coherently divide an electron beam… View Article
April 17, 2019Published by Stephan Sponar
Gravitation-induced quantum interference for neutrons Classically, the neutron will just fall as a mass in a gravitational field like any other particle. This has been experimentally detected in 1965 by Dabbs and repeated with increased accuracy by Koester and Schiedmayer. The results are a correspondence up to the measurement accuracy of 0.02 %. In the… View Article
April 12, 2019Published by Stephan Sponar
Matter wave interferometry for inertial sensing and tests of fundamental physics D. Schlippert, H. Albers, S. Bode, W. Ertmer, A. Herbst, C. Meiners, L. L. Richardson, A. Rajagopalan, R. Rengelink, C. Schubert, K. Stolzenberg, D. Tell, É. Wodey, F. Guzmán, E. M. Rasel Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, 30167 Hannover, Germany Today’s… View Article
April 11, 2019Published by Stephan Sponar
Quantum Contextuality in Neutron Spin Echo Interferometry Conventional neutron interferometers utilize a perfect silicon crystal to split a neutron beam into two coherent sub beams. The same crystal also reflects and recombines the two beams, resulting in interference of the two partial wavefunctions at the detector. In instruments which use neutron spin echo interferometry, like… View Article
April 11, 2019Published by Stephan Sponar
Spin-Rotation Coupling Observed in Neutron Interferometry Spin-rotation coupling is an extension of the Sagnac effect, based upon the inertia of intrinsic spin. Its existence was predicted and neutron interferometric experiments to verify it were proposed [1,2]. The latter suggestion was to induce a coupling between the spin and the rotation of a magnetic field. The… View Article
April 1, 2019Published by Stephan Sponar
Matter-wave experiments with biomolecular nanomatter Markus Arndt for QNP@UNIVIE University of Vienna, Boltzmanngasse 5, 1090 Wien, Austria Matter-wave interferometry with biological nanomatter [1,2] explores the frontier between quantum physics, biochemistry, nanotechnology, asking how biological structure affects quantum-delocalization and if biology can provide natural nanotechnology for quantum experiments [3]. We ask what needs to be done to… View Article