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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.


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Interference pattern with a contrast of 0.91.
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f0050: Interference pattern with a contrast of 0.91.

Mentions: The contrast of the IFM is very sensitive to temperature fluctuations. Even temperature changes by 0.1 °C disturb the interference pattern. Since the guide field and the Larmor-accelerators produce heat, both elements are water cooled. This is done by two temperature stabilised water pumps. To optimise the temperature of the cooling water for the guide field and the boxes, temperature scans are performed. In Fig. 9 the contrast of the IFM is plotted for different temperatures of the cooling water in the boxes. For 25.2 °C an average contrast of is achieved. After stabilisation contrast up to C=0.91 can be observed as seen in Fig. 10. When the temperature is raised up to 26.8 °C the contrast drops to . A raise by 1 °C in temperature results in a decrease in contrast of C=0.60.


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)

Interference pattern with a contrast of 0.91.
© Copyright Policy - CC BY
Related In: Results  -  Collection

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

f0050: Interference pattern with a contrast of 0.91.
Mentions: The contrast of the IFM is very sensitive to temperature fluctuations. Even temperature changes by 0.1 °C disturb the interference pattern. Since the guide field and the Larmor-accelerators produce heat, both elements are water cooled. This is done by two temperature stabilised water pumps. To optimise the temperature of the cooling water for the guide field and the boxes, temperature scans are performed. In Fig. 9 the contrast of the IFM is plotted for different temperatures of the cooling water in the boxes. For 25.2 °C an average contrast of is achieved. After stabilisation contrast up to C=0.91 can be observed as seen in Fig. 10. When the temperature is raised up to 26.8 °C the contrast drops to . A raise by 1 °C in temperature results in a decrease in contrast of C=0.60.

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