Publications

emty line

2024:

E. Kreuzgruber, R. Wagner, N. Geerits, H. Lemmel, and S. Sponar, Violation of a Leggett–Garg inequality using ideal negative measurements in neutron interferometry, arXiv:2307.04409 [quant-ph].

H. Fischer, C. Käding, H. Lemmel, S. Sponar, and M. Pitschmann, Search for Dark Energy with Neutron Interferometry, Prog. Theor. Exp. Phys. 2024, 14 (2024) or arXiv:2303.18092 [quant-ph].

2023:

N. Geerits, H. Lemmel, A. S. Berger, and S. Sponar, Phase Vortex Lattices in Neutron Interferometry,  Communications Physics 6, 209 (2023) or arXiv:2205.00536 [quant-ph].

A. Danner, N. Geerits, H. Lemmel, R. Wagner, S. Sponar, and Yuji Hasegawa, Three-Path Quantum Cheshire Cat Observed in Neutron Interferometry, Communications Physics 7, 14 (2023) or arXiv:2303.18092 [quant-ph].

A. Danner, H. Lemmel, R. Wagner, S. Sponar, and Y. Hasegawa, Neutron Interferometer Experiments Studying Fundamental Features of Quantum Mechanics, Atoms 11, 98 (2023).

R. Wagner, W. Kersten, H. Lemmel, S. Sponar, and Y. Hasegawa, Quantum causality emerging in a delayed‐choice quantum Cheshire Cat experiment with neutrons, Scientific Reports 13, 3865 (2023).

2022:

H. Lemmel, M. Jentschel, H. Abele, F. Lafont, Guerard, C. P. Sasso, G. Manac and E. Massa, Neutron interference from a split-crystal interferometer, J. Appl. Cryst. 55, 870-875 (2022).

H. Lemmel, N. Geerits, A. Danner, H. F. Hofmann, and S. Sponar, Quantifying the presence of a neutron in the paths of an interferometer, Physical Review Research 4, 023075 (2022) or arXiv:2202.00272 [quant-ph] or Spektrum.de.

2021:

R. Wagner, W. Kersten, A. Danner, H. Lemmel, A. Kumar Pan, and S. Sponar, Direct experimental test of commutation relation via imaginary weak value, Physical Review Research 3, 023243 (2021) or arXiv:2012.08171 [quant-ph].

S. Sponar, A. Danner, M. Ozawa, and Y. Hasegawa, Neutron Optical Test of Completeness of Quantum Root-Mean-Square Errors, npj Quantum Information 7, 106 (2021) or arXiv:2009.06418 [quant-ph].

S. Sponar, A. Danner, V. Pecile, N. Einsidler, B. Demirel, and Y. Hasegawa, Experimental Test of Entropic Noise-Disturbance Uncertainty Relations for Three-Outcome Qubit Measurements, Physical Review Research 3, 023175 (2021) or arXiv:2005.13410 [quant-ph].

S. Sponar, R. I. P. Sedmik, M. Pitschmann, H. Abele, and Y. Hasegawa, Tests of fundamental quantum mechanics and dark interactions with low-energy neutrons, Nature Reviews Physics 3, 309 – 327 (2021), DIO: 10.1038/s42254-021-00298-2, Extended Vers. [quant-ph/2012.09048].

Niels Geerits and Stephan Sponar, Twisting Neutral Particles with Electric Fields, Physical Review A 103, 022205 (2021)
or arXiv:2007.03345 [quant-ph].

2020:

S. Sponar, A. Danner, K. Obigane, S. Hack, and Y. Hasegawa, Experimental Test of Tight State-Independent Preparation Uncertainty Relations for Qubits, Physical Review A 102, 042204 (2020) or [quant-ph/2002.10725].

A. Danner, B. Demirel, W. Kersten, H. Lemmel, R. Wagner, S. Sponar, and Y. Hasegawa, Spin-rotation coupling observed in neutron interferometry, npj Quantum Information 6, 23 (2020) or [quant-ph/1904.07085].

B. Demirel, S. Sponar, and Y. Hasegawa, Measurements of Entropic Uncertainty Relations in Neutron Optics,
Applied Science 10, 1087 (2020).

M. Willsch, D. Willsch, K. Michielsen, F. Jin, T. Denkmayr, S. Sponar, Y. Hasegawa, and H. De Raedt, Long-Time Correlations in Single-Neutron Interferometry Data, Journal of the Physical Society of Japan 89, 064005 (2020).

2019:

S. Sponar, H. Geppert-Kleinrath, T. Denkmayr, H. Lemmel, and Y. Hasegawa, Asking Neutrons where they have been,
J. Phys.: Conf. Ser. 1316, 012002 (2019).

N. Geerits, S. R. Parnell, M. A. Thijs, A. A. van Well, C. Franz, A. L. Washington, D. Raspino, R. M. Dalgliesh, and J. Plomp Time of flight modulation of intensity by zero effort on Larmor, Review of Scientific Instruments 90, 125101 (2019).

R. Wagner, L. Brandl, W. Kersten, S. Sponar, Y. Hasegawa, C. Huber, F. Bruckner and D. Suess, 3D printed magnets for neutron spin manipulation, EPJ Web Conf. 219, 10008 (2019).

W. Kersten, L. Brandl, R. Wagner, C. Huber, F. Bruckner, A. Hasegawa, D. Suess, and S. Sponar, Additive-Manufactured and Topology-Optimized Permanent-Magnet Spin Rotator for Neutron Interferometry, Physical Review Applied 12, 014023 (2019) or [quant-ph/1810.13225 ].

A. Danner, B. Demirel, S. Sponar and Y. Hasegawa, Development and perfomance of a miniaturised spin rotator suitable for neutron interferometer experiments, Journal of Physics Communications 3, 035001 (2019).

B. Demirel, S. Sponar, A. A. Abbott, C. Branciard, and Y. Hasegawa, Experimental test of an entropic measurement uncertainty relation for arbitrary qubit observables, New Journal of Physics 21, 013038 (2019) or [quant-ph/1711.05023].

M. Blackener, B. Demirel , I. Drevenšek-Olenik, M. Fally, P. Flauger, P. Geltenbort, Y. Hasegawa, R. Kurinjimala, M. Ličen, C. Pruner, S. Sponar, Y. Tomita, and J. Klepp, Monte-Carlo simulation of neutron transmission through nanocomposite materials for neutron-optics applications, Nuclear Instruments and Methods in Physics Research A 916, 454–157 (2019)  or [quant-ph/1804.07263 ].

2018:

H. Geppert-Kleinrath, T. Denkmayr, S. Sponar, H. Lemmel, T. Jenke, and Y. Hasegawa, Multifold paths of neutrons in the three-beam interferometer detected by a tiny energy kick, Physical Review A 97, 052111 (2018) or [quant-ph/1805.05093].

T. Denkmayr, J. Dressel, H. Geppert-Kleinrath, Y. Hasegawa. and S. Sponar, Weak values from strong interactions in neutron interferometry, Physica B, 551, 339-346  (2018).

2017:

M. Waegell, T. Denkmayr, H. Geppert, D. Ebner, T. Jenke, Y. Hasegawa, S. Sponar, J. Dressel, J. Tollaksen, Confined contextuality in neutron interferometry: Observing the quantum pigeonhole effect, Physical Review A 96, 052131 (2017) or [quant-ph/1609.06046].

Georg Sulyok and Stephan Sponar, Heisenberg’s error-disturbance uncertainty relation: Experimental study of competing approaches,
Physical Review A 96, 022137 (2017).

T. Denkmayr, H. Geppert, H. Lemmel, M. Waegell, J. Dressel, Y. Hasegawa, and S. Sponar, Experimental Demonstration of Direct Path State Characterization by Strongly Measuring Weak Values in a Matter-Wave Interferometer, Physical Review Letters 118, 010402 (2017) or [quant-ph/1604.04102].

2016:

B. Demirel, S. Sponar, G. Sulyok, M. Ozawa, and Y. Hasegawa, Experimental Test of Residual Error-Disturbance Uncertainty Relations for Mixed Spin-1⁄2 States, Physical Review Letters 117, 140402 (2016) or [quant-ph/1511.03462].

S. Sponar, Error-disturbance uncertainty relations in neutron spin measurements, International Journal of Quantum Information 14, 1640016 (2016).

S. Sponar, T. Denkmayr, H. Geppert, and Y. Hasegawa, Fundamental Features of Quantum Dynamics Studied in Matter-Wave Interferometry—Spin Weak Values and the Quantum Cheshire-Cat,  Atoms 4, 11 (2016).

2015:

S. Sponar, T. Denkmayr, H. Geppert, H. Lemmel, A. Matzkin, J. Tollaksen, and Y. Hasegawa, Weak values obtained in matter-wave interferometry, Physical Review A 92, 062121 (2015) or [quant-ph/1404.2125].

G. Sulyok, S. Sponar, B. Demirel, F. Buscemi, M. J. Hall, M. Ozawa, and Y. Hasegawa, Experimental test of entropic noise-disturbance uncertainty relations for spin – 1/2 measurements, Physical Review Letters 115, 030401 (2015) or [quant-ph/1504.04200].

B. Demirel, S. Sponar, and Y. Hasegawa, Measurement of the spin-rotation coupling in neutron polarimetry, New Journal of Physics 17, 023065 (2015).

H. Lemmel, P. Brax, A. Ivanov, T. Jenke, G. Pignol, M. Pitschmann, T. Potocar, M. Wellenzohn, M. Zawisky, H. Abele, Neutron interferometry constrains dark energy chameleon fields, Physics Letters B 743, 310 – 314 (2015).

V.-O. de Haan, J. Plomp, A. A. van Well, M. T. Rekveldt, Y. Hasegawa, R. M. Dalgliesh, and N.-J. Steinke, Measurement of gravitation-induced quantum interference for neutrons in a spin-echo spectrometer, Physical Review A 89, 063611 (2015).

2014:

S. Sponar, G. Sulyok, J. Erhart, and Y. Hasegawa, Error-Disturbance Uncertainty Relations in Neutron-Spin Measurements, Advances in High Energy Physics 2014, 735398 (2014).

T. Denkmayr, H. Geppert, S. Sponar, H. Lemmel, A. Matzkin, J. Tollaksen, and Y. Hasegawa, Observation of a quantum Cheshire Cat in a matter-wave interferometer experiment, Nature Communications 5, 4492 (2014).

J. Klepp, S. Sponar, and Y. Hasegawa, Fundamental phenomena of quantum mechanics explored with neutron interferometers, Progress of Theoretical and Experimental Physics 2014, 082A0 (2014) or [quant-ph/1407.2526].

H. Geppert, T. Denkmayr, S. Sponar, H. Lemmel, and Y. Hasegawa, Improvement of the polarized neutron interferometer setup demonstrating violation of a Bell-like inequality, Nuclear Instruments and Methods in Physics Research A 763, 417–423 (2014) or [quant-ph/1404.3512].

2013:

G. Sulyok, S. Sponar, J. Erhart, G. Badurek, M. Ozawa, and Y. Hasegawa, Violation of Heisenberg’s error-disturbance uncertainty relation in spin measurements, Physical Review A 88, 022110 (2013) or [quant-ph/1305.7251].

D. Erdösi, M. Huber, B. C. Hiesmayr, and Y. Hasegawa, Proving the generation of genuine multipartite entanglement in a single-neutron interferometer experiment, New Journal of Physics 15, 023033  (2013).

Hartmut Lemmel, Influence of Bragg diffraction on perfect crystal neutron phase shifters and the exact solution of the two-beam case in the dynamical diffraction theory, Acta Crystallographica A 69, 459–474 (2013).

2012:

S. Sponar, J. Klepp, K. Durstberger-Rennhofer, H. Geppert, M. Both, C. S. Schmitzer, H. Bartosik, G. Badurek, and Y. Hasegawa, High-efficiency manipulations of triply entangled states in neutron polarimetry, New Journal of Physics 14, 053032 (2012).

J. Erhart, S. Sponar, G. Sulyok, G. Badurek, M. Ozawa, and Y. Hasegawa, Experimental demonstration of a universally valid error-disturbance uncertainty relation in spin-measurements, Nature Physics 8, 185-189 (2012) or [quant-ph/1201.1833].

Y. Hasegawa, C. Schmitzer, H. Bartosik, J. Klepp, S. Sponar, K. Durstberger-Rennhofer, and G. Badurek, Falsification of Leggett’s model using neutron matter-waves, New Journal of Physics 14, 023039 (2012).

2011:

Yuji Hasegawa and Helmut Rauch: Quantum phenomena explored with neutrons, New Journal of Physics 13 115010 (2011).

2010:

S. Sponar, J. Klepp, R. Loidl, S. Filipp, K. Durstberger, R. Bertlmann, G. Badurek, H. Rauch, and Y. Hasegawa, Geometric phase in entangled systems: A single- neutron interferometer experiment, Physical Review A 81, 042113 (2010).

S. Sponar, J. Klepp, K. Durstberger, R. Loidl, S. Filipp, M. Lettner, R. Bertlmann, G. Badurek, H. Rauch, and Y. Hasegawa, New aspects of geometric phases in experiments with polarized neutrons, Journal of Physics A: Mathematical and Theoretical 43, 354015 (2010).

S. Sponar, J. Klepp, C. Zeiner, G. Badurek, and Y. Hasegawa, Violation of a Bell-like inequality for spin-energy entanglement in neutron polarimetry, Physics Letters A 374, 431-434 (2010) or [quant-ph/0907.4654].

Y. Hasegawa, R. Loidl, G. Badurek, K. Durstberger, S. Sponar, and H. Rauch, Engineering of triply entangled states in a single-neutron system, Physical Review A 81, 032121 (2010).

Y. Hasegawa, K. Durstberger, S. Sponar, and H. Rauch, Kochen-Specker theorem studied with neutron interferometer, Nuclear Instruments and Methods in Physics Research A 634, 21-24 (2010).

Hartmut Lemmel and Apoorva G. Wagh, Phase shifts and wave-packet displacements in neutron interferometry and a nondispersive, nondefocusing phase shifter, Physical Review A 82, 033626 (2010).

J. Springer, M. Zawisky, H. Lemmel and M. Suda, A neutron interferometric measurement of a phase shift induced by Laue transmission, Acta Crystallographica A 66, 17-21 (2010).

H. Bartosik, J. Klepp, C. Schmitzer, S. Sponar, A. Cabello, H. Rauch, and Y. Hasegawa, Experimental test of quantum contextuality in neutron interferometry, Physical Review Letters 103, 040403 (2009) or [quant-ph/0904.4576].

Y. Hasegawa, G. Badurek, S. Filipp, J. Klepp, R. Loidl, S. Sponar, and H. Rauch, Entanglement between degrees of freedom of single-neutrons, Nuclear Instruments and Methods in Physics Research A 611, 310-313 (2009).

2008:

S. Sponar J. Klepp, R. Loidl, S. Filipp, G. Badurek, Y. Hasegawa, and H. Rauch, Coherent energy manipulation in single-neutron interferometry, Physical Review A 78, 061604(R) (2008) or [quant-ph/0803.3545].

J. Klepp, S. Sponar, S. Filipp, M. Lettner, G. Badurek, and Y. Hasegawa, Observation of Nonadditive Mixed-State Phases with Polarized Neutrons, Physical Review Letters 101, 150404 (2008) or [quant-ph/0809.0572].

S. Sponar, J. Klepp, G. Badurek, and Y. Hasegawa, Zero-field and Larmor spinor precessions in a neutron polarimeter experiment, Physics Letters A 372, 3153-3156 (2008) or [quant-ph/0802.1411].

important publications between 2001 and 2007:

Y. Hasegawa, R. Loidl, G. Badurek, S. Filipp, J. Klepp, and H. Rauch, Evidence for entanglement and full tomographic analysis of Bell states in a single-neutron system, Physical Review A 76, 052108 (2007).

H. Lemmel, Dynamical diffraction of neutrons and transition from beam splitter to phase shifter case, Physical Review B 76, 144305 (2007).

Y. Hasegawa, R. Loidl, G. Badurek, M Baron, and H. Rauch, Quantum Contextuality in a Single-Neutron Optical Experiment, Physical Review Letters 97, 230401 (2006).

Y. Hasegawa, R. Loidl, G. Badurek, M. Baron, and H. Rauch, Violation of a Bell-like inequality in single-neutron interferometry, Nature (London) 425, 45 (2003).

H. Rauch, H. Lemmel, M. Baron, and R. Loidl, Measurement of a confinement induced neutron phase, Nature (London) 417, 630 (2002).

Y. Hasegawa, R. Loidl, G. Badurek, M Baron, and H. Rauch, Off-Diagonal Geometric Phase in a Neutron Interferometer Experiment, Physical Review Letters 87, 070401 (2001).

selected publications with historical relevance between 1974 and 2000:

H. Rauch, M. Suda, and S. Pascazio, Decoherence, dephasing and depolarization, Physica B 267, 277 (1999).

J. Summhammer, K. A. Hamacher, H. Kaiser, H. Weinfurter, D. L. Jacobson, and S. A. Werner, Multiphoton Exchange Amplitudes Observed by Neutron Interferometry, Physical Review Letters 75, 3206 (1995).

J. Summhammer, H. Rauch, and D. Tuppinger, Stochastic and deterministic absorption in neutron-interference experiments,  Physical Review A 36, 4447 (1987).

G. Badurek, H. Rauch, and D. Tuppinger, Neutron interferometric double-resonance experiment, Physical Review A 34, 2600 (1986).

G. Badurek, H. Rauch, and J. Summhammer, Time-dependent superposition of spinors, Physical Review Letters 51, 1015 (1983).

J. Summhammer, G. Badurek, H. Rauch, U. Kischko, and A. Zeilinger, Direct observation of fermion spin superposition by neutron interferometry, Physical Review A 27, 2523 (1983).

R. Collela, A. W. Overhauser, and S. A. Werner, Observation of Gravitationally Induced Quantum Interference, Physical Review Letters 34, 1472 (1975).

H. Rauch, A. Zeilinger, G. Badurek, A. Wilfing, W. Bauspiess, and U. Bonse, Verification of coherent spinor rotation of fermions, Physics Letters 54A, 425 (1975).

H. Rauch, W. Treimer, and U. Bonse, Test of a single crystal neutron interferometer, Physics Letters 47A, 369 (1974).