Related references
Note: Only part of the references are listed.
Article
Optics
Maximilien Barbier et al.
Summary: Quantum backflow refers to the counterintuitive phenomenon where the probability can flow opposite to the momentum of a quantum particle. In one-dimensional systems, backflow is small and bounded, but in two-dimensional systems with degenerate energy eigenstates, backflow can be unbounded. We investigate a charged particle confined to a finite disk with a magnetic flux line passing through its center perpendicular to the disk, and demonstrate that quantum backflow can be unbounded in this system, which makes it a promising platform for experimental observation of this fundamental quantum phenomenon.
Article
Physics, Multidisciplinary
Anat Daniel et al.
Summary: The interference pattern of light beams was first observed by Thomas Young in 1801. The visibility of fringes is highest when the two beams have equal intensities, and decreases as the ratio of beam intensities deviates from unity. In this study, the backflow phenomenon in the wavefront of unequally amplitude beams' superposition is experimentally observed. Backflow exists in both optics and quantum mechanics, and is closely related to superoscillations used in super resolution imaging and particle path manipulations. Previous attempts to observe backflow were challenging, but by utilizing basic interference, it is revealed that backflow in optical fields is robust and common.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Lin Htoo Zaw et al.
Summary: Building upon Tsirelson's work, this study presents a series of protocols for detecting the nonclassicality of suitable states in a single quantum system, assuming the measured dynamical observable undergoes a uniform precession. The researchers extend the previous work by Tsirelson to include the case of the harmonic oscillator. Additionally, they apply the protocols to finite-dimensional spins undergoing uniform precession in real space, observing a gap between the classical and quantum expectations for all j 32 (excluding j = 2).
Article
Quantum Science & Technology
Maximilien Barbier et al.
Summary: The study investigates a new, experiment-friendly formulation of quantum backflow and compares it with the standard formulation when applied to a free particle. It is found that the two formulations are not always compatible, but there is a parameter regime where they appear to be in qualitative agreement.
Article
Physics, Multidisciplinary
A. J. Bracken
Summary: New quantum probability flow bounds and associated eigenfunctions for a free non-relativistic particle were determined numerically, revealing interesting behavior as momentum values vary. The results show differences and similarities between quantum and classical behaviors, with unexpected effects observed in the quantum system.
Article
Quantum Science & Technology
Marek Miller et al.
Summary: Quantum backflow is a quantum interference phenomenon where the probability current of a quantum particle points opposite to its momentum. This study quantifies the amount of quantum backflow for arbitrary momentum distributions, providing a framework for experimental verification. Examples of backflow in gravitational and harmonic potential are given, along with discussions on the necessary experimental procedures for demonstration using atomic gravimeters.
Article
Optics
Arseni Goussev
Summary: Quantum backflow is the effect of negative probability current accompanying the free motion of a quantum particle with a wave function entirely comprised of plane waves with non-negative momenta, which has not been observed experimentally yet. However, it can become significantly more pronounced and observable by forcing the particle to move in a circular ring instead of along a straight line.
Article
Optics
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Article
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J. J. Halliwell et al.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
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Education, Scientific Disciplines
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EUROPEAN JOURNAL OF PHYSICS
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M Penz et al.
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
(2006)
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Physics, Multidisciplinary
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