Observation of a quantum Cheshire Cat in a matter-wave interferometer experiment

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作者：
Tobias Denkmayr
Hermann Geppert
Stephan Sponar
Hartmut Lemmel
Alexandre Matzkin
Jeff Tollaksen
Yuji Hasegawa
机构：
[1] Atominstitut,
[2] Vienna University of Technology,undefined
[3] Institut Laue-Langevin,undefined
[4] Laboratoire de Physique Théorique et Modélisation,undefined
[5] CNRS Unité 8089,undefined
[6] Université de Cergy-Pontoise,undefined
[7] Institute for Quantum Studies and Schmid College of Science and Technology,undefined
[8] Chapman University,undefined
来源：
Nature Communications | / 5卷
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摘要：
From its very beginning, quantum theory has been revealing extraordinary and counter-intuitive phenomena, such as wave-particle duality, Schrödinger cats and quantum non-locality. Another paradoxical phenomenon found within the framework of quantum mechanics is the ‘quantum Cheshire Cat’: if a quantum system is subject to a certain pre- and postselection, it can behave as if a particle and its property are spatially separated. It has been suggested to employ weak measurements in order to explore the Cheshire Cat’s nature. Here we report an experiment in which we send neutrons through a perfect silicon crystal interferometer and perform weak measurements to probe the location of the particle and its magnetic moment. The experimental results suggest that the system behaves as if the neutrons go through one beam path, while their magnetic moment travels along the other.
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