Quantum contextuality in neutron interferometer experiments

2006 ◽  
Vol 385-386 ◽  
pp. 1377-1380 ◽  
Author(s):  
Yuji Hasegawa ◽  
Rudolf Loidl ◽  
Matthias Baron ◽  
Gerald Badurek ◽  
Helmut Rauch
Keyword(s):  
Quantum Contextuality ◽  
Neutron Interferometer

Violation of a bell-like inequality in single-neutron interferometer experiments: Quantum contextuality

2004 ◽  
Vol 51 (6-7) ◽  
pp. 967-972 ◽  
Author(s):  
Yuji Hasegawa ◽  
Rudolf Loidl ◽  
Gerald Badurek ◽  
Matthias Baron ◽  
Helmut Rauch
Keyword(s):  
Quantum Contextuality ◽  
Single Neutron ◽  
Neutron Interferometer

Violation of a Bell-like inequality in single-neutron interferometer experiments: quantum contextuality

2004 ◽  
Vol 51 (6-7) ◽  
pp. 967-972
Author(s):  
Helmut Rauch ◽  
Yuji Hasegawa ◽  
Rudolf Loidl ◽  
Gerald Badurek ◽  
Matthias Baron
Keyword(s):  
Quantum Contextuality ◽  
Single Neutron ◽  
Neutron Interferometer

scholarly journals Indistinguishability and Negative Probabilities

Entropy ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 829
Author(s):  
J. Acacio de Barros ◽  
Federico Holik
Keyword(s):  
Quantum Systems ◽  
Quantum Contextuality ◽  
No Signaling ◽  
Definition Of ◽  
Do So

In this paper, we examined the connection between quantum systems’ indistinguishability and signed (or negative) probabilities. We do so by first introducing a measure-theoretic definition of signed probabilities inspired by research in quantum contextuality. We then argue that ontological indistinguishability leads to the no-signaling condition and negative probabilities.

A New Result with a Two Crystal Component Neutron Interferometer

1979 ◽  
Vol 46 (3) ◽  
pp. 1024-1024 ◽  
Author(s):  
Seishi Kikuta ◽  
Toshio Takahashi ◽  
Kan Nakayama ◽  
Yasuhiko Fujii ◽  
Sadao Hoshino
Keyword(s):  
Neutron Interferometer

scholarly journals QUANTUM INTERFERENCE EFFECTS IN SPACETIME OF SLOWLY ROTATING COMPACT OBJECTS IN BRANEWORLD

2010 ◽  
Vol 25 (04) ◽  
pp. 243-256 ◽  
Author(s):  
A. I. MAMADJANOV ◽  
A. A. HAKIMOV ◽  
S. R. TOJIEV
Keyword(s):  
Phase Shift ◽  
Quantum Interference ◽  
Relativistic Quantum ◽  
Additional Term ◽  
Compact Objects ◽  
Sagnac Effect ◽  
Interference Effects ◽  
Upper Limit ◽  
Neutron Interferometer ◽  
Shift Effect

The relativistic quantum interference effects in the spacetime of slowly rotating object in braneworld as the Sagnac effect and phase shift effect of interfering particle in neutron interferometer are derived in unified way. It is found that in the case of the Sagnac effect, the influence of brane parameter is becoming important due to the fact that the angular velocity of the locally non-rotating observer is increased by the brane tension. In the case of neutron interferometry, it is found that an additional term in the phase shift of interfering particle emerges due to the presence of the brane parameter Q*. From the obtained expressions of phase shift in Mach–Zehnder interferometer upper limit for brane parameter has been estimated. From the results of the recent experiments we have obtained upper limit for the tidal charge as Q* ≲ 107 cm 2. Finally, as an example, we apply the obtained results to the calculation of the (ultra-cold neutrons) energy level modification in the gravitational field of slowly rotating gravitating object in the braneworld.

Measurement and alleviation of subsurface damage in a thick-crystal neutron interferometer

2019 ◽  
Vol 75 (6) ◽  
pp. 833-841 ◽  
Author(s):  
Benjamin Heacock ◽  
Robert Haun ◽  
Katsuya Hirota ◽  
Takuya Hosobata ◽  
Michael G. Huber ◽  
...  
Keyword(s):  
High Precision ◽  
Chemical Etching ◽  
Subsurface Damage ◽  
Interference Signal ◽  
Precision Grinding ◽  
Angular Misalignment ◽  
Thick Crystal ◽  
Neutron Interferometer ◽  
Grinding Technique ◽  
Spatially Varying

The construction is described of a monolithic thick-crystal perfect silicon neutron interferometer using an ultra-high-precision grinding technique and a combination of annealing and chemical etching that differs from the construction of prior neutron interferometers. The interferometer is the second to have been annealed after machining and the first to be annealed prior to chemical etching. Monitoring the interference signal at each post-fabrication step provides a measurement of subsurface damage and its alleviation. In this case, the strain caused by subsurface damage manifests itself as a spatially varying angular misalignment between the two relevant volumes of the crystal and is reduced from ∼10−5 rad to ∼10−9 rad by way of annealing and chemical etching.

scholarly journals Quantum Contextuality and Indeterminacy

Entropy ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 867
Author(s):  
Gregg Jaeger
Keyword(s):  
Quantum Mechanics ◽  
Hidden Variables ◽  
Equivalence Classes ◽  
Measuring Apparatus ◽  
Classical Physics ◽  
Quantum Contextuality ◽  
Natural Feature ◽  
Classical Models ◽  
Quantum Behavior ◽  
Quantum Observables

The circumstances of measurement have more direct significance in quantum than in classical physics, where they can be neglected for well-performed measurements. In quantum mechanics, the dispositions of the measuring apparatus-plus-environment of the system measured for a property are a non-trivial part of its formalization as the quantum observable. A straightforward formalization of context, via equivalence classes of measurements corresponding to sets of sharp target observables, was recently given for sharp quantum observables. Here, we show that quantum contextuality, the dependence of measurement outcomes on circumstances external to the measured quantum system, can be manifested not only as the strict exclusivity of different measurements of sharp observables or valuations but via quantitative differences in the property statistics across simultaneous measurements of generalized quantum observables, by formalizing quantum context via coexistent generalized observables rather than only its subset of compatible sharp observables. Here, the question of whether such quantum contextuality follows from basic quantum principles is then addressed, and it is shown that the Principle of Indeterminacy is sufficient for at least one form of non-trivial contextuality. Contextuality is thus seen to be a natural feature of quantum mechanics rather than something arising only from the consideration of impossible measurements, abstract philosophical issues, hidden-variables theories, or other alternative, classical models of quantum behavior.

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