Information transfer by quantum matterwave modulation

Classical communication schemes that exploit wave modulation are the basis of the information era. The transfer of information based on the quantum properties of photons revolutionized these modern communication techniques. Here we demonstrate that also matterwaves can be applied for information transfer and that their quantum nature provides a high level of security. Our technique allows transmitting a message by a non-trivial modulation of an electron matterwave in a biprism interferometer. The data is encoded by a Wien filter introducing a longitudinal shift between separated matterwave packets. The transmission receiver is a delay line detector performing a dynamic contrast analysis of the fringe pattern. Our method relies on the Aharonov-Bohm effect and has no light optical analog since it does not shift the phase of the electron interference. A passive eavesdropping attack will cause decoherence and terminating the data transfer. This is demonstrated by introducing a semiconducting surface that disturbs the quantum state by Coulomb interaction and reduces the contrast. We also present a key distribution protocol based on the quantum nature of the matterwaves that can reveal active eavesdropping

The Implacable Surge of History : Investigating Jewish Activism in Atlanta During the Civil Rights Movement

Existing works on southern Jewry illustrate how most southern Jews were concerned with self-preservation during the Civil Rights Movement. Many historians have untangled perceptions of southern Jewish detachment from civil rights issues to explain how individuals and communities were torn between their sympathy towards the African- American plight and Jewish vulnerability during a period of heightened racial tension. This project draws connections among the American Civil Rights Movement, the southern Jewish experience, and Atlanta race relations in order to identify instances of southern Jewish involvement in the fight for racial equality. What were the forms of activism Jews chose, the circumstances that shaped those decisions, and the underlying goals behind them? Studying Atlanta’s Jewish communities during the 1950s and 1960s helps broaden the conversation on Jewish activism, raise questions of southern Jewish identity, and uncover distinctive avenues for change. Analysis suggests that, although their story is less known, Jewish organizations and individuals in Atlanta found ways to contribute to the fight for civil rights equality within the context of the Jim Crow South

Size Distribution by Light Scattering from Individual Particles

The particle size distribution of a polystyrene latex has been determined using a new light-scattering photometer which measures the scattered radiance as .a function of scattering angle of single aerosolized particles as they are levitated in a laser beam. The results are in agreement with those obtained by conventional light scattering and by electron microscopy. In addition to the main population, two classes of smaller particles were observed. This single particle light-scattering technique offers the possibility of analyzing broader size distributions than heretofore amenable to light scattering and has the added advantage of not requiring any a priori assumptions about the form of the particle size distribution

The Belle Of New York : Selection

https://digitalcommons.library.umaine.edu/mmb-ps/2551/thumbnail.jp

The Harmless Little Girlie With The Downcast Eyes

https://digitalcommons.library.umaine.edu/mmb-vp/3140/thumbnail.jp