Three-Path Quantum Cheshire Cat Observed in Neutron Interferometry
- URL: http://arxiv.org/abs/2303.18092v1
- Date: Fri, 31 Mar 2023 14:30:16 GMT
- Title: Three-Path Quantum Cheshire Cat Observed in Neutron Interferometry
- Authors: Armin Danner, Niels Geerits, Hartmut Lemmel, Richard Wagner, Stephan
Sponar and Yuji Hasegawa
- Abstract summary: The paradoxical phenomenon of the quantum Cheshire Cat (qCC) refers to situations where different properties of a particle appear to be localised in different paths of an interferometer.
The localisations are determined qualitatively through conspicuous changes induced by weak interactions.
It is demonstrated that the three properties of neutrons are found separated in different paths in the interferometer.
- Score: 1.4680035572775534
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The paradoxical phenomenon of the quantum Cheshire Cat (qCC) refers to
situations where different properties of a particle appear to be localised in
different paths of an interferometer and therefore spatially separated. This
observation is obtained by implementing a pre- and postselection procedure. The
localisations are determined qualitatively through conspicuous changes induced
by weak interactions. Previous demonstrations of the qCC only used the path and
spin/polarisation degrees of freedom. In addition, the present experiment uses
the neutron's energy as a third property in a three-path interferometer. It is
demonstrated that the three properties of neutrons are found separated in
different paths in the interferometer; a detailed analysis suggests that the
appearance of a property is strongly related to the geometrical relation
between the state vectors of pre- and postselection with weak interactions in
between. If a weak interaction in a path locally generates a state vector with
a component parallel to the reference state in another path, a conspicuous
intensity oscillation is expected and observed. Therefore, the appearance of
the observed intensity oscillations is attributed solely to the cross-terms
between the reference and the newly generated state via weak interactions.
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