Über Neutronenbeugung

Halban, H. v.; Preiswerk, P.

doi:10.1007/978-3-642-91426-3_5

Cited by 13 publications

(16 citation statements)

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“…The quantum wave nature of matter was first proposed by de Broglie in 1923 [13] and soon confirmed for electrons [14,15], atoms and diatomic molecules [16] as well as for neutrons [17]. With the development of modern molecular beam machines, ultra-cold atomic ensembles, Bose-Einstein condensates, For example, the detection or non-detection of a photon at a certain time could serve as a basis choice.…”

Section: Extending Matter-wave Interferometrymentioning

confidence: 99%

How to extend quantum experiments

Arndt¹,

Aspelmeyer²,

Zeilinger³

2009

Fortschritte der Physik

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Key words Foundations of quantum physics, wave-particle duality, quantum entanglement, mesoscopic quantum physics, quantum-classical transition. PACS 03.65.-w, 03.65.Ta, 03.65.Ud, 03.65.Yz, 03.67.-a, 03.67.Mn This paper is dedicated to Prof. Paolo Tombesi on the occasion of his 70th birthday.Modern experimental developments allow to address the fundamental challenges of quantum physics on new, macroscopic scales. How far can such experiments be pushed with current technology? We discuss three specific examples, long-distance photonic entanglement, matter wave interferometry and superposition states of mechanical resonators, and discuss possible extensions to these experiments. It turns out that there is "plenty of room at the top" for macroscopic quantum experiments, even with presently available technology.

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Section: Extending Matter-wave Interferometrymentioning

confidence: 99%

How to extend quantum experiments

Arndt¹,

Aspelmeyer²,

Zeilinger³

2009

Fortschritte der Physik

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“…If this is not the case, the trapping potential term in equation (1) has to be modified to β tr ( j − δ) 2 = β tr j 2 − 2β tr δ j + const, where δ ∈ [0, 1] describes the offset of the trap center in the z-direction with respect to the lattice minima, and an analogous modification has to be done to the interaction term. This adds a small term linear in j and therefore leads to a slight modification of the Bloch oscillation frequency.…”

Section: Phase Evolution In the Matter-wave Interferometermentioning

confidence: 99%

Modules Over Lie Algebras Allowing a First Cartan Extension

Krulyuk¹

1979

Russ. Math. Surv.

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The phenomenon of matter-wave interference lies at the heart of quantum physics. It has been observed in various contexts in the limit of non-interacting particles as a single-particle effect. Here we observe and control matter-wave interference whose evolution is driven by interparticle interactions. In a multi-path matter-wave interferometer, the macroscopic manybody wave function of an interacting atomic Bose-Einstein condensate develops a regular interference pattern, allowing us to detect and directly visualize the effect of interaction-induced phase shifts. We demonstrate control over the phase evolution by inhibiting interaction-induced dephasing and by refocusing a dephased macroscopic matter wave in a spin-echo-type experiment. Our results show that interactions in a many-body system lead to a surprisingly coherent evolution, possibly enabling narrow-band and high-brightness matterwave interferometers based on atom lasers.

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“…The diffraction of neutrons was first demonstrated using radioisotope-driven (, n) sources in experiments carried out by von Halban & Preiswerk (1936) and Mitchell & Powers (1936) soon after James Chadwick's discovery of the neutron in 1932 (Chadwick, 1932), but the low intensity of early neutron sources prevented further exploitation of the effect. These first diffraction experiments were aimed at demonstrating properties of neutrons themselves, namely the waveparticle duality of the neutron.…”

Section: Introductionmentioning

confidence: 99%