Larmor clock and measuring of neutron interaction time with quantum objects

Frank, A. I.; Bondarenko, I. V.; Kozlov, A.; Høghøj, Peter; Ehlers, Georg

doi:10.1016/s0921-4526(00)00822-x

Cited by 17 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all these cases, the coupling of the spin space (Larmor precession) and the momentum space (Zeeman splitting) becomes obvious. This time delay also provides the basis for Larmor clocks with time resolutions on the order of 10 -10 s, as tested by Frank et al (2001). Equation (2.36) shows clearly that the polarization measured in a certain direction is the Fourier transform of the wavelength distribution function.…”

Section: Neutron Interferometers and Apparatusmentioning

confidence: 94%

Neutron Interferometry 2nd Edn

Rauch¹,

Werner²

2015

130

View full text Add to dashboard Cite

In this new edition we have retained the overall structure of the original book. It now consists of 12 chapters. We have shifted some material from later chapters to the first chapter. In particular, we have described gravitationally induced quantum interference (COW experiment) and early experiments on spin rotation, spinors, and spin-related phases in Chapter 1. These results have gotten broad attention in recent years and are now described in various standard physics textbooks. This change in format was done with a view of the close connection of these experiments with the atom interferometry field and with the modern ideas on entanglement now permeating all of the modern quantum mechanical literature.Neutron interferometry is a mature technique in experimental physics. The use of the perfect silicon crystal interferometer to accurately measure scattering lengths of many isotopes is given in Chapter 3. Very accurate measurements of the neutron scattering lengths of the proton, deuteron, and He-3 have been carried out in recent years. These results confine the parameters in various theoretical models of few-body nuclear physics.Chapter 4 is retitled "Coherence and Decoherence," so as to include many new topics connected to the current emphasis in certain areas of physics related to how coherent quantum systems decohere and evolve into systems described by classical Lagrangian and Hamiltonian mechanics. The quantum concepts of entanglement, contexuality, squeezing, Wigner functions, interactions of quantum systems with the environment, post selection experiments, measures of distinguishability, intensity-intensity correlations, and Bell's inequalities are the general topics of this expanded chapter. "Contexuality and Kochen-Specker Phenomena" are discussed in a new Chapter 7.Our original Chapter 8 dealing with forthcoming and more speculative experiments is now Chapter 10. Some of those experiments have advanced considerably over the intervening 12 years since the publication of the 1st edition. Experiments related to searches for non-Newtonian gravity at short distances have been pursued in various confined geometries, such as transmission through narrow slits. Related ideas, called "bouncing ball" experiments, have successfully observed quantized states of ultra-cold neutrons in the Earth's gravity. An experiment designed to observe the Anandan acceleration has not yet been attempted. The observation of relativistic proper time effects, as suggested in Chapter 8, occurs at the level of 10 -9 . Suggested observation of such effects in atom beam interferometry, related to a gravitational redshift, has generated interesting, but controversial papers. Perhaps there is a way to pursue such effects with neutron interferometry utilizing the Pendellösung interference fringes, as discussed in this chapter on "Gravitational, Inertial, and Motional Effects." A feasible time-dependent Fizeau experiment is described to study new motional effects and for the cooling of neutron beams.Various new techniques and experiments of...

show abstract

Section: Neutron Interferometers and Apparatusmentioning

confidence: 94%

Neutron Interferometry 2nd Edn

Rauch¹,

Werner²

2015

130

View full text Add to dashboard Cite

show abstract

“…The value for n = 2 could be within reach of a dedicated time-of-flight experiment measuring the precession of polarized neutrons through a gas [14]. For n > 2 the phase shift is very small and decreases as n grows.…”

mentioning

confidence: 92%

Probing additional dimensions in the universe with neutron experiments

Frank¹

2004

AIP Conference Proceedings

View full text Add to dashboard Cite

We carry out a simple analysis of (n + 3)-dimensional gravity in the context of recent work on 'large' supplementary dimensions and deduce a formula for the expected compactification radius for the n additional dimensions in the universe, as a function of the Planck and the electro-weak scales. We argue that the correspondingly modified gravitational force gives rise to effects that might be within the detection range of dedicated neutron experiments. A scattering analysis of the corresponding modified gravitational forces suggests that slow neutron scattering off atomic nuclei with null spin may provide an experimental test for these ideas.The study of gravity at short range has recently been the subject of numerous theoretical and experimental investigations, sparked by the proposal by Arkani-Hamed, Dimoupoulos, and Dvali (ADD) [1] that gravity may depart from Newton's inverse square law at scales which could be as large as a millimeter. Diverse experimental groups have built refined versions of torsion balance experiments and other ingenious designs to test gravity at submillimeter ranges [2]. On the theoretical front, hundreds of papers have been written, ranging from alternative formulations of the large extra-dimensions framework (LED) [3], to the study of astrophysical constraints and the expected experimental consequences in future high-energy collider experiments to black-hole production and the effect of LED on fundamental symmetries. But perhaps the most remarkable result to date is the fact that no known physical constraints have as yet falsified the LED theories. From the experimental point of view the new measurements have confirmed the validity of Newton's

show abstract

“…Hence, the ''Larmor clock'' (for instance, Ref. [8]) of the neutron in the magnetic field of the sample acts as a direct measure of the difference of spatial shift, as the velocity of the neutron is (almost) constant.…”

mentioning

confidence: 99%