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Improvement of the polarized neutron interferometer setup demonstrating violation of a Bell-like inequality.

Geppert H, Denkmayr T, Sponar S, Lemmel H, Hasegawa Y - Nucl Instrum Methods Phys Res A (2014)

Bottom Line: For precise measurements with polarised neutrons high efficient spin-manipulation is required.The gain in performance is exploited demonstrating violation of a Bell-like inequality for a spin-path entangled single-neutron state.The new setup is more flexible referring to state preparation and analysis, therefore new, more precise measurements can be carried out.

View Article: PubMed Central - PubMed

Affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.

ABSTRACT

For precise measurements with polarised neutrons high efficient spin-manipulation is required. We developed several neutron optical elements suitable for a new sophisticated setup, i.e., DC spin-turners and Larmor-accelerators which diminish thermal disturbances and depolarisation considerably. The gain in performance is exploited demonstrating violation of a Bell-like inequality for a spin-path entangled single-neutron state. The obtained value of [Formula: see text], which is much higher than previous measurements by neutron interferometry, is [Formula: see text] above the limit of S=2 predicted by contextual hidden variable theories. The new setup is more flexible referring to state preparation and analysis, therefore new, more precise measurements can be carried out.

No MeSH data available.


Related in: MedlinePlus

Raster scan showing the contrast of the IFM with respect to position in xz-plane.
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f0040: Raster scan showing the contrast of the IFM with respect to position in xz-plane.

Mentions: For optimisation of a measurement every part of the setup should be adjusted in a systematic way. First of all the point of highest interference contrast on the IFM, i.e. the sweet spot is looked for. The interferometer crystal is mapped by moving an aperture vertically and horizontally in the xz-plane in front of the IFM and measuring the contrast on each position. The result of such a raster scan is shown in Fig. 8. This scan is performed with a beam cross-section of 3× 3 mm2 and a step increment of 1 mm. One can see that only a small part of the IFM provides highest contrast, which reaches at C=0.82.


Improvement of the polarized neutron interferometer setup demonstrating violation of a Bell-like inequality.

Geppert H, Denkmayr T, Sponar S, Lemmel H, Hasegawa Y - Nucl Instrum Methods Phys Res A (2014)

Raster scan showing the contrast of the IFM with respect to position in xz-plane.
© Copyright Policy - CC BY
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4375610&req=5

f0040: Raster scan showing the contrast of the IFM with respect to position in xz-plane.
Mentions: For optimisation of a measurement every part of the setup should be adjusted in a systematic way. First of all the point of highest interference contrast on the IFM, i.e. the sweet spot is looked for. The interferometer crystal is mapped by moving an aperture vertically and horizontally in the xz-plane in front of the IFM and measuring the contrast on each position. The result of such a raster scan is shown in Fig. 8. This scan is performed with a beam cross-section of 3× 3 mm2 and a step increment of 1 mm. One can see that only a small part of the IFM provides highest contrast, which reaches at C=0.82.

Bottom Line: For precise measurements with polarised neutrons high efficient spin-manipulation is required.The gain in performance is exploited demonstrating violation of a Bell-like inequality for a spin-path entangled single-neutron state.The new setup is more flexible referring to state preparation and analysis, therefore new, more precise measurements can be carried out.

View Article: PubMed Central - PubMed

Affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.

ABSTRACT

For precise measurements with polarised neutrons high efficient spin-manipulation is required. We developed several neutron optical elements suitable for a new sophisticated setup, i.e., DC spin-turners and Larmor-accelerators which diminish thermal disturbances and depolarisation considerably. The gain in performance is exploited demonstrating violation of a Bell-like inequality for a spin-path entangled single-neutron state. The obtained value of [Formula: see text], which is much higher than previous measurements by neutron interferometry, is [Formula: see text] above the limit of S=2 predicted by contextual hidden variable theories. The new setup is more flexible referring to state preparation and analysis, therefore new, more precise measurements can be carried out.

No MeSH data available.


Related in: MedlinePlus