2,281 research outputs found
An evaluation of the implementation of Georgia's Pre-k program: Report of the findings from the Georgia Early Childhood Study (2002-03)
After ten years, Georgia continues to lead the nation in providing full day, publicly subsidized Pre-K to four-year-olds whose parents choose to enroll them. In this report, we assess the extent to which differences in the way Pre-K is implemented affect children's development. Do teachers with higher levels of education have more positive impacts on children's development? Do teaching styles make a difference in terms of children's outcomes by the end of kindergarten? Do children taught using certain curricula fare better than those taught using others? Answers to questions such as these can assist Pre-K administrators in refining Georgia's program and inform those in other states who are developing or expanding their prekindergarten programs
Extraction of entanglement from quantum fields with entangled particle detectors
We consider two initially entangled Unruh-DeWitt particle detectors and
examine how the initial entanglement changes after interacting with a quantum
scalar field. As initially nonentangled detectors extract entanglement from the
field, entangled detectors also can gain more entanglement so long as they are
weakly correlated at the beginning. For initially sufficiently entangled
detectors, only degradation takes place. We then apply our analysis to a
gravitational shockwave spacetime and show that a shockwave could enhance the
initial entanglement of weakly entangled detectors. Moreover, we find that this
enhancement can occur for greater detector separations than in Minkowski
spacetime.Comment: 13 pages, 6 figure
Tripartite Entanglement Extraction from the Black Hole Vacuum
The first investigation of tripartite entanglement harvesting in the vicinity
of a black hole is carried out. Working in the context of a static
Ba\~{n}ados-Teitelboim-Zanelli (BTZ) black hole spacetime we find that it is
possible to harvest tripartite entanglement in regions where harvesting of
bipartite entanglement is known to be impossible due to intense Hawking
radiation. In these situations, it implies that the harvested entanglement is
of the Greenberger-Horne-Zeilinger (GHZ) type.Comment: 12 pages, 8 figures; (v2) matched to the final versio
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