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Journal of the Physical Society of Japan

Geometric phase in a split-beam experiment measured with coupled neutron interference loops

Yuji Hasegawa, Michael Zawisky, H. Rauch, A. Ioffe

Published Jan 1, 1996• 0 citations
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Geometric phase in coupled neutron interference loops

Yuji Hasegawa, Michael Zawisky, H. Rauch +1 more

A geometric phase factor is derived for a split-beam experiment as an example of cyclic evolutions. Poincar\'e sphere descriptions for the split-beam experiment show its geometric property. We observe this geometric phase with a two-loop neutron interferometer, where a reference beam can be added to the beam from one interference loop. The combination of phase shifters and partial absorbers permitted the compensation of the dynamical phase and measurement of the geometric phase. All the experimental results show complete agreement with our theoretical treatment. We discuss a situation where a geometric phase exists even when the dynamical phase becomes zero. \textcopyright{} 1996 The American Physical Society.

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Neutron interferometer experiments have served as elegant demonstrations of the foundations of quantum mechanics. We show here two interferometer-experiments: one is the demonstration of a geometric phase in a split-beam experiment and the other is the measurement of off-diagonal geometric phase acquired in an evolution of a 1/2-spin system. The former was accomplished with the use of a two-loop neutron interferometer, where a reference beam can be added to the beam from one interference ioop. The combination of phase shifters and partial absorbers permitted the compensation of the dynamical phase and measurement of the geometric phase. The latter is investigated by means of a polarized neutron interferometer. Final counts with and without the polarization analysis enabled us to observe both the off-diagonal and diagonal geometric phases in two detectors. All experimental results show complete agreement with theoretical treatments.

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Comment on “Geometric phase in coupled neutron interference loops”

Apoorva G. Wagh

Two interferometrically split and recombined subbeams which are in the same quantum state are treated as mutually orthogonal states by Hasegawa et al. [Phys. Rev. A 53, 2486 (1996)]. This conceptual error has created the illusion of a geometric phase in U(1) evolutions.

Physical Review A•Feb 1, 1999•6 citations
A geometric phase factor is derived for a split-beam experiment as an example of cyclic evolutions. Poincar\'e sphere descriptions for the split-beam experiment show its geometric property. We observe this geometric phase with a two-loop neutron interferometer, where a reference beam can be added to the beam from one interference loop. The combination of phase shifters and partial absorbers permitted the compensation of the dynamical phase and measurement of the geometric phase. All the experimental results show complete agreement with our theoretical treatment. We discuss a situation where a geometric phase exists even when the dynamical phase becomes zero. \textcopyright{} 1996 The American Physical Society.
Neutron interferometer experiments have served as elegant demonstrations of the foundations of quantum mechanics. We show here two interferometer-experiments: one is the demonstration of a geometric phase in a split-beam experiment and the other is the measurement of off-diagonal geometric phase acquired in an evolution of a 1/2-spin system. The former was accomplished with the use of a two-loop neutron interferometer, where a reference beam can be added to the beam from one interference ioop. The combination of phase shifters and partial absorbers permitted the compensation of the dynamical phase and measurement of the geometric phase. The latter is investigated by means of a polarized neutron interferometer. Final counts with and without the polarization analysis enabled us to observe both the off-diagonal and diagonal geometric phases in two detectors. All experimental results show complete agreement with theoretical treatments.