Comment on ``Measurement of quantum states of neutrons in the Earth's gravitational field"

Details Comment on ``Measurement of quantum states of neutrons in the Earth's gravitational field" Comment on ``Measurement of quantum states of neutrons in the Earth's gravitational field"

2003-08-21

arxiv.org/abs/quant-ph/0308108v1

Phys.Rev. D68 (2003) 108701

Physics

Quantum Physics

4 pages, to appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.68.108701

In the paper by V.V. Nesvizhevsky et al., Phys. Rev. D 67, 102002 (2003), it is argued that the lowest quantum state of neutrons in the Earth's gravitational field has been experimentally identified. While this is most likely correct, it is imperative to investigate all alternative explanations of the result in order to close all loopholes, as it is the first experiment ever claimed to have observed gravitational quantum states. Here we show that geometrical effects in the experimental setup can mimic the results attributed to gravity. Modifications of the experimental setup to close these possible loopholes are suggested.

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